Revert "Moved AstResult back to IQueryBuilderEngine."

This reverts commit d8bb845ae9c70894ed0b64c1b3ca59fb8eb4069e.

Change-Id: I9606951953d457c4041102d6072d0add67a74bac
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoEditPlugin.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoEditPlugin.java
index 1c12eeb..7920731 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoEditPlugin.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoEditPlugin.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoItemProviderAdapterFactory.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoItemProviderAdapterFactory.java
index 2810e84..42f11f8 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoItemProviderAdapterFactory.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/AcceleoItemProviderAdapterFactory.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BindingItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BindingItemProvider.java
index 058d20d..c240991 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BindingItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BindingItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockCommentItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockCommentItemProvider.java
index 38bcaeb..664adc8 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockCommentItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockCommentItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockItemProvider.java
index 8fcd967..c6091a2 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/BlockItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentBodyItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentBodyItemProvider.java
index 64ff901..58e7947 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentBodyItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentBodyItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentItemProvider.java
index 7f07811..c421f2b 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/CommentItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBindingItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBindingItemProvider.java
index 0b15cfa..58d3baf 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBindingItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBindingItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBlockCommentItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBlockCommentItemProvider.java
index 465bb9d..b66f0aa 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBlockCommentItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorBlockCommentItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorCommentItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorCommentItemProvider.java
index e4f4ffe..317b455 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorCommentItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorCommentItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionItemProvider.java
index eb11281..98faed4 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -17,7 +17,7 @@
 import org.eclipse.acceleo.AcceleoPackage;
 import org.eclipse.acceleo.ErrorExpression;
 import org.eclipse.acceleo.query.ast.AstFactory;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.AdapterFactory;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.util.ResourceLocator;
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionStatementItemProvider.java
index 959da13..3729fe4 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorExpressionStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorFileStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorFileStatementItemProvider.java
index 36f8224..4a14b02 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorFileStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorFileStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorForStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorForStatementItemProvider.java
index 48de7d7..ad5880f 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorForStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorForStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorIfStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorIfStatementItemProvider.java
index bc2f893..9db8cf5 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorIfStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorIfStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorImportItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorImportItemProvider.java
index b37fcf7..b97dece 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorImportItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorImportItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorLetStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorLetStatementItemProvider.java
index 8f0bcc9..16538b1 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorLetStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorLetStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorMetamodelItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorMetamodelItemProvider.java
index 8044402..0b24e32 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorMetamodelItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorMetamodelItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleDocumentationItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleDocumentationItemProvider.java
index dade89d..9bff809 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleDocumentationItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleDocumentationItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleElementDocumentationItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleElementDocumentationItemProvider.java
index 622daa7..328b79d 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleElementDocumentationItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleElementDocumentationItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleItemProvider.java
index 2b467dd..be249db 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleReferenceItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleReferenceItemProvider.java
index 833154e..93e315c 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleReferenceItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorModuleReferenceItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorProtectedAreaItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorProtectedAreaItemProvider.java
index 1f456c5..f8e646c 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorProtectedAreaItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorProtectedAreaItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorQueryItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorQueryItemProvider.java
index 1bceac9..48ae7cb 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorQueryItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorQueryItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorTemplateItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorTemplateItemProvider.java
index a56c0d3..f979c21 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorTemplateItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorTemplateItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorVariableItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorVariableItemProvider.java
index 26e1aa4..ac684fa 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorVariableItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ErrorVariableItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionItemProvider.java
index 0fbe75b..fcb6252 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -17,7 +17,7 @@
 import org.eclipse.acceleo.AcceleoPackage;
 import org.eclipse.acceleo.Expression;
 import org.eclipse.acceleo.query.ast.AstFactory;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.AdapterFactory;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.util.ResourceLocator;
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionStatementItemProvider.java
index 7968ff7..ba9dd51 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ExpressionStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/FileStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/FileStatementItemProvider.java
index 3b9fa93..0fd251e 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/FileStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/FileStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ForStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ForStatementItemProvider.java
index e57abee..3680756 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ForStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ForStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/IfStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/IfStatementItemProvider.java
index c03c2a2..e4f747e 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/IfStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/IfStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ImportItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ImportItemProvider.java
index d3c4ae5..59b1e72 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ImportItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ImportItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LeafStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LeafStatementItemProvider.java
index 8f9a508..46f79e3 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LeafStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LeafStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LetStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LetStatementItemProvider.java
index ed33098..83858af 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LetStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/LetStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/MetamodelItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/MetamodelItemProvider.java
index e17a054..9d1a29b 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/MetamodelItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/MetamodelItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleDocumentationItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleDocumentationItemProvider.java
index ba18356..8c9f418 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleDocumentationItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleDocumentationItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementDocumentationItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementDocumentationItemProvider.java
index 824b5e8..2a1053b 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementDocumentationItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementDocumentationItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementItemProvider.java
index 7a9db51..54582ad 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleElementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleItemProvider.java
index c322120..d856960 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleReferenceItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleReferenceItemProvider.java
index 17900ea..09e823e 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleReferenceItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ModuleReferenceItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NamedElementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NamedElementItemProvider.java
index 4243eb3..cec9390 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NamedElementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NamedElementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NewLineStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NewLineStatementItemProvider.java
index fe70cfd..063bea4 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NewLineStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/NewLineStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ParameterDocumentationItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ParameterDocumentationItemProvider.java
index 43778a4..1a8e851 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ParameterDocumentationItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ParameterDocumentationItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ProtectedAreaItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ProtectedAreaItemProvider.java
index de71a75..02b11d6 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ProtectedAreaItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/ProtectedAreaItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/QueryItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/QueryItemProvider.java
index 42b6a88..8d2cab8 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/QueryItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/QueryItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TemplateItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TemplateItemProvider.java
index 7c3ac50..54de3ee 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TemplateItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TemplateItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TextStatementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TextStatementItemProvider.java
index 2845df6..2da9318 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TextStatementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TextStatementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TypedElementItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TypedElementItemProvider.java
index 1fcb071..736a1e3 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TypedElementItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/TypedElementItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -17,7 +17,7 @@
 import org.eclipse.acceleo.AcceleoPackage;
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.query.ast.AstFactory;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.AdapterFactory;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.util.ResourceLocator;
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/VariableItemProvider.java b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/VariableItemProvider.java
index 37a9ebe..4c595ad 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/VariableItemProvider.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src-gen/org/eclipse/acceleo/provider/VariableItemProvider.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql.edit/src/org/eclipse/acceleo/provider/utils/ASTUtils.java b/plugins/org.eclipse.acceleo.aql.edit/src/org/eclipse/acceleo/provider/utils/ASTUtils.java
index 70383cc..8a75774 100644
--- a/plugins/org.eclipse.acceleo.aql.edit/src/org/eclipse/acceleo/provider/utils/ASTUtils.java
+++ b/plugins/org.eclipse.acceleo.aql.edit/src/org/eclipse/acceleo/provider/utils/ASTUtils.java
@@ -1,5 +1,5 @@
 /*******************************************************************************

- * Copyright (c) 2021 Obeo.

+ * Copyright (c) 2020 Obeo.

  * All rights reserved. This program and the accompanying materials

  * are made available under the terms of the Eclipse Public License v1.0

  * which accompanies this distribution, and is available at

@@ -11,8 +11,8 @@
 package org.eclipse.acceleo.provider.utils;

 

 import org.eclipse.acceleo.Expression;

+import org.eclipse.acceleo.query.parser.AstResult;

 import org.eclipse.acceleo.query.parser.AstSerializer;

-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;

 

 /**

  * A helper to render AST expressions.

diff --git a/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/AbstractConverter.java b/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/AbstractConverter.java
index 2c3b008..c0073f8 100644
--- a/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/AbstractConverter.java
+++ b/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/AbstractConverter.java
@@ -1,5 +1,5 @@
 /*******************************************************************************

- * Copyright (c) 2017, 2021 Obeo.

+ * Copyright (c) 2017 Obeo.

  * All rights reserved. This program and the accompanying materials

  * are made available under the terms of the Eclipse Public License v1.0

  * which accompanies this distribution, and is available at

@@ -14,7 +14,7 @@
 import java.util.List;

 

 import org.eclipse.acceleo.aql.migration.MigrationException;

-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;

+import org.eclipse.acceleo.query.parser.AstResult;

 import org.eclipse.emf.common.util.Diagnostic;

 import org.eclipse.emf.ecore.EObject;

 

diff --git a/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/ModuleConverter.java b/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/ModuleConverter.java
index 4da06e2..5c6458c 100644
--- a/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/ModuleConverter.java
+++ b/plugins/org.eclipse.acceleo.aql.migration/src/org/eclipse/acceleo/aql/migration/converters/ModuleConverter.java
@@ -1,5 +1,5 @@
 /*******************************************************************************

- * Copyright (c) 2017, 2021 Obeo.

+ * Copyright (c) 2017 Obeo.

  * All rights reserved. This program and the accompanying materials

  * are made available under the terms of the Eclipse Public License v1.0

  * which accompanies this distribution, and is available at

@@ -66,7 +66,7 @@
 import org.eclipse.acceleo.query.ast.Expression;

 import org.eclipse.acceleo.query.ast.Lambda;

 import org.eclipse.acceleo.query.ast.VariableDeclaration;

-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;

+import org.eclipse.acceleo.query.parser.AstResult;

 import org.eclipse.emf.common.util.Diagnostic;

 import org.eclipse.emf.common.util.EList;

 import org.eclipse.emf.ecore.EClassifier;

diff --git a/plugins/org.eclipse.acceleo.aql/model/acceleo.ecore b/plugins/org.eclipse.acceleo.aql/model/acceleo.ecore
index a4db10d..d59631a 100644
--- a/plugins/org.eclipse.acceleo.aql/model/acceleo.ecore
+++ b/plugins/org.eclipse.acceleo.aql/model/acceleo.ecore
@@ -346,7 +346,7 @@
     <eStructuralFeatures xsi:type="ecore:EAttribute" name="indentationNeeded" lowerBound="1"
         eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
   </eClassifiers>
-  <eClassifiers xsi:type="ecore:EDataType" name="ASTResult" instanceClassName="org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult"/>
+  <eClassifiers xsi:type="ecore:EDataType" name="ASTResult" instanceClassName="org.eclipse.acceleo.query.parser.AstResult"/>
   <eClassifiers xsi:type="ecore:EDataType" name="ModuleQualifiedName" instanceClassName="java.lang.String"/>
   <eClassifiers xsi:type="ecore:EDataType" name="AcceleoAstResult" instanceClassName="org.eclipse.acceleo.aql.parser.AcceleoAstResult"/>
 </ecore:EPackage>
diff --git a/plugins/org.eclipse.acceleo.aql/model/acceleo.genmodel b/plugins/org.eclipse.acceleo.aql/model/acceleo.genmodel
index 1f418ad..4a26de9 100644
--- a/plugins/org.eclipse.acceleo.aql/model/acceleo.genmodel
+++ b/plugins/org.eclipse.acceleo.aql/model/acceleo.genmodel
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>

 <genmodel:GenModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore"

-    xmlns:genmodel="http://www.eclipse.org/emf/2002/GenModel" copyrightText="Copyright (c) 2008, 2021 Obeo.&#xD;&#xA;&#xD;&#xA;All rights reserved. This program and the accompanying materials&#xD;&#xA;are made available under the terms of the Eclipse Public License v1.0&#xD;&#xA;which accompanies this distribution, and is available at&#xD;&#xA;http://www.eclipse.org/legal/epl-v10.html&#xD;&#xA;&#xD;&#xA;Contributors:&#xD;&#xA;     Obeo - initial API and implementation"

+    xmlns:genmodel="http://www.eclipse.org/emf/2002/GenModel" copyrightText="Copyright (c) 2008, 2020 Obeo.&#xD;&#xA;&#xD;&#xA;All rights reserved. This program and the accompanying materials&#xD;&#xA;are made available under the terms of the Eclipse Public License v1.0&#xD;&#xA;which accompanies this distribution, and is available at&#xD;&#xA;http://www.eclipse.org/legal/epl-v10.html&#xD;&#xA;&#xD;&#xA;Contributors:&#xD;&#xA;     Obeo - initial API and implementation"

     modelDirectory="/org.eclipse.acceleo.aql/src-gen" editDirectory="/org.eclipse.acceleo.aql.edit/src-gen"

     editorDirectory="/org.eclipse.acceleo.aql.editor/src-gen" modelPluginID="org.eclipse.acceleo.aql"

     modelName="Acceleo" editPluginClass="org.eclipse.acceleo.provider.AcceleoEditPlugin"

diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ASTNode.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ASTNode.java
index 872ad7f..936de62 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ASTNode.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ASTNode.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoFactory.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoFactory.java
index b3a7ef3..ffc4855 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoFactory.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoFactory.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoPackage.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoPackage.java
index dabdffc..24e5e17 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoPackage.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/AcceleoPackage.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -3428,7 +3428,7 @@
 	 * The meta object id for the '<em>AST Result</em>' data type.
 	 * <!-- begin-user-doc -->
 	 * <!-- end-user-doc -->
-	 * @see org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult
+	 * @see org.eclipse.acceleo.query.parser.AstResult
 	 * @see org.eclipse.acceleo.impl.AcceleoPackageImpl#getASTResult()
 	 * @generated
 	 */
@@ -5260,12 +5260,12 @@
 	EEnum getOpenModeKind();
 
 	/**
-	 * Returns the meta object for data type '{@link org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult <em>AST Result</em>}'.
+	 * Returns the meta object for data type '{@link org.eclipse.acceleo.query.parser.AstResult <em>AST Result</em>}'.
 	 * <!-- begin-user-doc -->
 	 * <!-- end-user-doc -->
 	 * @return the meta object for data type '<em>AST Result</em>'.
-	 * @see org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult
-	 * @model instanceClass="org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult"
+	 * @see org.eclipse.acceleo.query.parser.AstResult
+	 * @model instanceClass="org.eclipse.acceleo.query.parser.AstResult"
 	 * @generated
 	 */
 	EDataType getASTResult();
@@ -6805,7 +6805,7 @@
 		 * The meta object literal for the '<em>AST Result</em>' data type.
 		 * <!-- begin-user-doc -->
 		 * <!-- end-user-doc -->
-		 * @see org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult
+		 * @see org.eclipse.acceleo.query.parser.AstResult
 		 * @see org.eclipse.acceleo.impl.AcceleoPackageImpl#getASTResult()
 		 * @generated
 		 */
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Binding.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Binding.java
index b6d0525..81fc935 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Binding.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Binding.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Block.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Block.java
index 5955ee7..a32dea8 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Block.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Block.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/BlockComment.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/BlockComment.java
index 765bbac..f1c5a10 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/BlockComment.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/BlockComment.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Comment.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Comment.java
index f31f0a9..86d4913 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Comment.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Comment.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/CommentBody.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/CommentBody.java
index cbee075..b210d8d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/CommentBody.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/CommentBody.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Documentation.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Documentation.java
index f6767f8..20cba51 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Documentation.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Documentation.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/DocumentedElement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/DocumentedElement.java
index 2c3c10a..9bd2b32 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/DocumentedElement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/DocumentedElement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Error.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Error.java
index 253ad84..a731097 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Error.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Error.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBinding.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBinding.java
index a7f111b..cd42b2f 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBinding.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBinding.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBlockComment.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBlockComment.java
index 5778f47..2c0e3b8 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBlockComment.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorBlockComment.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorComment.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorComment.java
index 1375f01..e439295 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorComment.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorComment.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpression.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpression.java
index 2d1e565..d5a06ef 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpression.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpression.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpressionStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpressionStatement.java
index 9caaae4..caec7d1 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpressionStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorExpressionStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorFileStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorFileStatement.java
index bbfda9b..857afa4 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorFileStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorFileStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorForStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorForStatement.java
index 466d333..9bd10b8 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorForStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorForStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorIfStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorIfStatement.java
index ddc74c7..98b0bcf 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorIfStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorIfStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorImport.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorImport.java
index a9654b9..0c24898 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorImport.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorImport.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorLetStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorLetStatement.java
index f13c336..b7b4eed 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorLetStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorLetStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorMetamodel.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorMetamodel.java
index b7bef0b..e3e4286 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorMetamodel.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorMetamodel.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModule.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModule.java
index 39940e2..8be4e0d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModule.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModule.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleDocumentation.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleDocumentation.java
index 0d03192..6c644ec 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleDocumentation.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleDocumentation.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleElementDocumentation.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleElementDocumentation.java
index f77260e..79f8430 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleElementDocumentation.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleElementDocumentation.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleReference.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleReference.java
index 5ddde72..85247a5 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleReference.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorModuleReference.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorProtectedArea.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorProtectedArea.java
index 719caa1..722c595 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorProtectedArea.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorProtectedArea.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorQuery.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorQuery.java
index 2e7b286..9f03ef9 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorQuery.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorQuery.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorTemplate.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorTemplate.java
index 4e4a37e..4fd4560 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorTemplate.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorTemplate.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorVariable.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorVariable.java
index 0db12be..2b9e903 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorVariable.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ErrorVariable.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Expression.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Expression.java
index e52dfae..51ebbc5 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Expression.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Expression.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -11,6 +11,8 @@
  */
 package org.eclipse.acceleo;
 
+import org.eclipse.acceleo.query.parser.AstResult;
+
 /**
  * <!-- begin-user-doc --> A representation of the model object '<em><b>Expression</b></em>'. <!--
  * end-user-doc -->
@@ -37,12 +39,12 @@
 	 * </p>
 	 * <!-- end-user-doc -->
 	 * @return the value of the '<em>Ast</em>' attribute.
-	 * @see #setAst(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)
+	 * @see #setAst(AstResult)
 	 * @see org.eclipse.acceleo.AcceleoPackage#getExpression_Ast()
 	 * @model dataType="org.eclipse.acceleo.ASTResult" required="true"
 	 * @generated
 	 */
-	org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getAst();
+	AstResult getAst();
 
 	/**
 	 * Sets the value of the '{@link org.eclipse.acceleo.Expression#getAst <em>Ast</em>}' attribute.
@@ -52,7 +54,7 @@
 	 * @see #getAst()
 	 * @generated
 	 */
-	void setAst(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult value);
+	void setAst(AstResult value);
 
 	/**
 	 * Returns the value of the '<em><b>Aql</b></em>' containment reference.
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ExpressionStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ExpressionStatement.java
index 99be067..034e661 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ExpressionStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ExpressionStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/FileStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/FileStatement.java
index 90a9309..4838607 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/FileStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/FileStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ForStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ForStatement.java
index b2cd58f..de149c2 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ForStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ForStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/IfStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/IfStatement.java
index 27506df..1cffe15 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/IfStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/IfStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Import.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Import.java
index b6ab012..455b47c 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Import.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Import.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LeafStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LeafStatement.java
index 8a4285f..9efe5b5 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LeafStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LeafStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LetStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LetStatement.java
index 7d45a35..ca6be1d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LetStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/LetStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Metamodel.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Metamodel.java
index dc9f895..0545a27 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Metamodel.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Metamodel.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Module.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Module.java
index d992fb6..67320e3 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Module.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Module.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleDocumentation.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleDocumentation.java
index d2c0094..1a97f92 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleDocumentation.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleDocumentation.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElement.java
index 9755f11..5cde0b4 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElementDocumentation.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElementDocumentation.java
index 54c9336..ffdff87 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElementDocumentation.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleElementDocumentation.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleReference.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleReference.java
index f0123ef..0ea8a72 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleReference.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ModuleReference.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NamedElement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NamedElement.java
index 5fac057..3ea10fe 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NamedElement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NamedElement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NewLineStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NewLineStatement.java
index 9d94f05..7ea32ab 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NewLineStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/NewLineStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/OpenModeKind.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/OpenModeKind.java
index 52991a3..a91f7e6 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/OpenModeKind.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/OpenModeKind.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ParameterDocumentation.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ParameterDocumentation.java
index 70b0b66..cb8ffe6 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ParameterDocumentation.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ParameterDocumentation.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ProtectedArea.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ProtectedArea.java
index 615aaad..b48638f 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ProtectedArea.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/ProtectedArea.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Query.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Query.java
index c5c1bb3..1a226d6 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Query.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Query.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Statement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Statement.java
index 8bcec1c..601a4b6 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Statement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Statement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Template.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Template.java
index a54d499..cd126f3 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Template.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Template.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TextStatement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TextStatement.java
index 4c323d2..16cb08d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TextStatement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TextStatement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TypedElement.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TypedElement.java
index 7cb5e05..10769b3 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TypedElement.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/TypedElement.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -12,6 +12,7 @@
 package org.eclipse.acceleo;
 
 import org.eclipse.acceleo.query.ast.Expression;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.ecore.EObject;
 
 /**
@@ -41,12 +42,12 @@
 	 * </p>
 	 * <!-- end-user-doc -->
 	 * @return the value of the '<em>Type</em>' attribute.
-	 * @see #setType(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)
+	 * @see #setType(AstResult)
 	 * @see org.eclipse.acceleo.AcceleoPackage#getTypedElement_Type()
 	 * @model dataType="org.eclipse.acceleo.ASTResult" required="true"
 	 * @generated
 	 */
-	org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getType();
+	AstResult getType();
 
 	/**
 	 * Sets the value of the '{@link org.eclipse.acceleo.TypedElement#getType <em>Type</em>}' attribute.
@@ -56,7 +57,7 @@
 	 * @see #getType()
 	 * @generated
 	 */
-	void setType(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult value);
+	void setType(AstResult value);
 
 	/**
 	 * Returns the value of the '<em><b>Type Aql</b></em>' containment reference.
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Variable.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Variable.java
index fb26707..ea77d19 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Variable.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/Variable.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/VisibilityKind.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/VisibilityKind.java
index 9b41483..2a6781d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/VisibilityKind.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/VisibilityKind.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoFactoryImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoFactoryImpl.java
index 3d2001d..bb71155 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoFactoryImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoFactoryImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -60,6 +60,7 @@
 import org.eclipse.acceleo.Variable;
 import org.eclipse.acceleo.VisibilityKind;
 import org.eclipse.acceleo.aql.parser.AcceleoAstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.ecore.EClass;
 import org.eclipse.emf.ecore.EDataType;
 import org.eclipse.emf.ecore.EObject;
@@ -801,10 +802,8 @@
 	 * <!-- end-user-doc -->
 	 * @generated
 	 */
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult createASTResultFromString(
-			EDataType eDataType, String initialValue) {
-		return (org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)super.createFromString(
-				eDataType, initialValue);
+	public AstResult createASTResultFromString(EDataType eDataType, String initialValue) {
+		return (AstResult)super.createFromString(eDataType, initialValue);
 	}
 
 	/**
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoPackageImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoPackageImpl.java
index e6ae26e..c587146 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoPackageImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/AcceleoPackageImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -67,6 +67,7 @@
 import org.eclipse.acceleo.VisibilityKind;
 import org.eclipse.acceleo.aql.parser.AcceleoAstResult;
 import org.eclipse.acceleo.query.ast.AstPackage;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.ecore.EAttribute;
 import org.eclipse.emf.ecore.EClass;
 import org.eclipse.emf.ecore.EDataType;
@@ -3127,9 +3128,8 @@
 		addEEnumLiteral(openModeKindEEnum, OpenModeKind.CREATE);
 
 		// Initialize data types
-		initEDataType(astResultEDataType,
-				org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult.class, "ASTResult", //$NON-NLS-1$
-				IS_SERIALIZABLE, !IS_GENERATED_INSTANCE_CLASS);
+		initEDataType(astResultEDataType, AstResult.class, "ASTResult", IS_SERIALIZABLE, //$NON-NLS-1$
+				!IS_GENERATED_INSTANCE_CLASS);
 		initEDataType(moduleQualifiedNameEDataType, String.class, "ModuleQualifiedName", IS_SERIALIZABLE, //$NON-NLS-1$
 				!IS_GENERATED_INSTANCE_CLASS);
 		initEDataType(acceleoAstResultEDataType, AcceleoAstResult.class, "AcceleoAstResult", IS_SERIALIZABLE, //$NON-NLS-1$
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BindingImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BindingImpl.java
index 58f9777..13b7d1d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BindingImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BindingImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockCommentImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockCommentImpl.java
index 77ca758..65c91e5 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockCommentImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockCommentImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockImpl.java
index a7e646f..7e5935b 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/BlockImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentBodyImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentBodyImpl.java
index 27df19f..6123eba 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentBodyImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentBodyImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentImpl.java
index 26ac72a..c404c4b 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/CommentImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBindingImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBindingImpl.java
index 7a16207..ce128f0 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBindingImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBindingImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -18,6 +18,7 @@
 import org.eclipse.acceleo.NamedElement;
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.Variable;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.notify.NotificationChain;
 import org.eclipse.emf.ecore.EClass;
@@ -54,7 +55,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected static final org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult TYPE_EDEFAULT = null;
+	protected static final AstResult TYPE_EDEFAULT = null;
 
 	/**
 	 * The cached value of the '{@link #getType() <em>Type</em>}' attribute.
@@ -64,7 +65,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult type = TYPE_EDEFAULT;
+	protected AstResult type = TYPE_EDEFAULT;
 
 	/**
 	 * The cached value of the '{@link #getTypeAql() <em>Type Aql</em>}' containment reference. <!--
@@ -223,18 +224,17 @@
 	 * @generated
 	 */
 	@Override
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getType() {
+	public AstResult getType() {
 		return type;
 	}
 
 	/**
-	 * <!-- begin-user-doc -->
-	 * <!-- end-user-doc -->
+	 * <!-- begin-user-doc --> <!-- end-user-doc -->
 	 * @generated
 	 */
 	@Override
-	public void setType(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult newType) {
-		org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult oldType = type;
+	public void setType(AstResult newType) {
+		AstResult oldType = type;
 		type = newType;
 		if (eNotificationRequired())
 			eNotify(new ENotificationImpl(this, Notification.SET, AcceleoPackage.ERROR_BINDING__TYPE, oldType,
@@ -526,7 +526,7 @@
 	public void eSet(int featureID, Object newValue) {
 		switch (featureID) {
 			case AcceleoPackage.ERROR_BINDING__TYPE:
-				setType((org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)newValue);
+				setType((AstResult)newValue);
 				return;
 			case AcceleoPackage.ERROR_BINDING__TYPE_AQL:
 				setTypeAql((org.eclipse.acceleo.query.ast.Expression)newValue);
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBlockCommentImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBlockCommentImpl.java
index b6d6155..5fc1092 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBlockCommentImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorBlockCommentImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorCommentImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorCommentImpl.java
index a1b9602..37d416c 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorCommentImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorCommentImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionImpl.java
index e946ff5..1c8b716 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -14,6 +14,7 @@
 import org.eclipse.acceleo.AcceleoPackage;
 import org.eclipse.acceleo.ErrorExpression;
 import org.eclipse.acceleo.Expression;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.Notification;
 
 import org.eclipse.emf.common.notify.NotificationChain;
@@ -46,7 +47,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected static final org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult AST_EDEFAULT = null;
+	protected static final AstResult AST_EDEFAULT = null;
 
 	/**
 	 * The cached value of the '{@link #getAst() <em>Ast</em>}' attribute.
@@ -56,7 +57,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult ast = AST_EDEFAULT;
+	protected AstResult ast = AST_EDEFAULT;
 
 	/**
 	 * The cached value of the '{@link #getAql() <em>Aql</em>}' containment reference.
@@ -93,7 +94,7 @@
 	 * @generated
 	 */
 	@Override
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getAst() {
+	public AstResult getAst() {
 		return ast;
 	}
 
@@ -103,8 +104,8 @@
 	 * @generated
 	 */
 	@Override
-	public void setAst(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult newAst) {
-		org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult oldAst = ast;
+	public void setAst(AstResult newAst) {
+		AstResult oldAst = ast;
 		ast = newAst;
 		if (eNotificationRequired())
 			eNotify(new ENotificationImpl(this, Notification.SET, AcceleoPackage.ERROR_EXPRESSION__AST,
@@ -203,7 +204,7 @@
 	public void eSet(int featureID, Object newValue) {
 		switch (featureID) {
 			case AcceleoPackage.ERROR_EXPRESSION__AST:
-				setAst((org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)newValue);
+				setAst((AstResult)newValue);
 				return;
 			case AcceleoPackage.ERROR_EXPRESSION__AQL:
 				setAql((org.eclipse.acceleo.query.ast.Expression)newValue);
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionStatementImpl.java
index a087c51..393d036 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorExpressionStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorFileStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorFileStatementImpl.java
index eacb4fc..d9a20c5 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorFileStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorFileStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorForStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorForStatementImpl.java
index 429cdae..6269f6f 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorForStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorForStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorIfStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorIfStatementImpl.java
index 4ca3c63..9b8553d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorIfStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorIfStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorImportImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorImportImpl.java
index 95c0408..4e30037 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorImportImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorImportImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorLetStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorLetStatementImpl.java
index 530122f..2e5a126 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorLetStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorLetStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorMetamodelImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorMetamodelImpl.java
index b06a07c..e057a63 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorMetamodelImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorMetamodelImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleDocumentationImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleDocumentationImpl.java
index c42c908..9350408 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleDocumentationImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleDocumentationImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleElementDocumentationImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleElementDocumentationImpl.java
index 949787f..e868f26 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleElementDocumentationImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleElementDocumentationImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleImpl.java
index 0cdc3af..21741bd 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleReferenceImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleReferenceImpl.java
index 1ed687e..0e49329 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleReferenceImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorModuleReferenceImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorProtectedAreaImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorProtectedAreaImpl.java
index 0ba6e86..6545d18 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorProtectedAreaImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorProtectedAreaImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorQueryImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorQueryImpl.java
index 2596bbc..6d60502 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorQueryImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorQueryImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -24,6 +24,7 @@
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.Variable;
 import org.eclipse.acceleo.VisibilityKind;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.notify.NotificationChain;
 import org.eclipse.emf.common.util.EList;
@@ -121,7 +122,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected static final org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult TYPE_EDEFAULT = null;
+	protected static final AstResult TYPE_EDEFAULT = null;
 
 	/**
 	 * The cached value of the '{@link #getType() <em>Type</em>}' attribute.
@@ -131,7 +132,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult type = TYPE_EDEFAULT;
+	protected AstResult type = TYPE_EDEFAULT;
 
 	/**
 	 * The cached value of the '{@link #getTypeAql() <em>Type Aql</em>}' containment reference. <!--
@@ -492,18 +493,17 @@
 	 * @generated
 	 */
 	@Override
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getType() {
+	public AstResult getType() {
 		return type;
 	}
 
 	/**
-	 * <!-- begin-user-doc -->
-	 * <!-- end-user-doc -->
+	 * <!-- begin-user-doc --> <!-- end-user-doc -->
 	 * @generated
 	 */
 	@Override
-	public void setType(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult newType) {
-		org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult oldType = type;
+	public void setType(AstResult newType) {
+		AstResult oldType = type;
 		type = newType;
 		if (eNotificationRequired())
 			eNotify(new ENotificationImpl(this, Notification.SET, AcceleoPackage.ERROR_QUERY__TYPE, oldType,
@@ -944,7 +944,7 @@
 				setName((String)newValue);
 				return;
 			case AcceleoPackage.ERROR_QUERY__TYPE:
-				setType((org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)newValue);
+				setType((AstResult)newValue);
 				return;
 			case AcceleoPackage.ERROR_QUERY__TYPE_AQL:
 				setTypeAql((org.eclipse.acceleo.query.ast.Expression)newValue);
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorTemplateImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorTemplateImpl.java
index 1dc7afe..5387563 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorTemplateImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorTemplateImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorVariableImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorVariableImpl.java
index 0ab9eaf..02789a4 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorVariableImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ErrorVariableImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -17,6 +17,7 @@
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.Variable;
 import org.eclipse.acceleo.query.ast.Expression;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.notify.NotificationChain;
 import org.eclipse.emf.ecore.EClass;
@@ -50,7 +51,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected static final org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult TYPE_EDEFAULT = null;
+	protected static final AstResult TYPE_EDEFAULT = null;
 
 	/**
 	 * The cached value of the '{@link #getType() <em>Type</em>}' attribute.
@@ -60,7 +61,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult type = TYPE_EDEFAULT;
+	protected AstResult type = TYPE_EDEFAULT;
 
 	/**
 	 * The cached value of the '{@link #getTypeAql() <em>Type Aql</em>}' containment reference. <!--
@@ -174,18 +175,17 @@
 	 * @generated
 	 */
 	@Override
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getType() {
+	public AstResult getType() {
 		return type;
 	}
 
 	/**
-	 * <!-- begin-user-doc -->
-	 * <!-- end-user-doc -->
+	 * <!-- begin-user-doc --> <!-- end-user-doc -->
 	 * @generated
 	 */
 	@Override
-	public void setType(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult newType) {
-		org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult oldType = type;
+	public void setType(AstResult newType) {
+		AstResult oldType = type;
 		type = newType;
 		if (eNotificationRequired())
 			eNotify(new ENotificationImpl(this, Notification.SET, AcceleoPackage.ERROR_VARIABLE__TYPE,
@@ -373,7 +373,7 @@
 	public void eSet(int featureID, Object newValue) {
 		switch (featureID) {
 			case AcceleoPackage.ERROR_VARIABLE__TYPE:
-				setType((org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)newValue);
+				setType((AstResult)newValue);
 				return;
 			case AcceleoPackage.ERROR_VARIABLE__TYPE_AQL:
 				setTypeAql((Expression)newValue);
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionImpl.java
index 71314a3..1bedb6c 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -13,6 +13,7 @@
 
 import org.eclipse.acceleo.AcceleoPackage;
 import org.eclipse.acceleo.Expression;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.Notification;
 
 import org.eclipse.emf.common.notify.NotificationChain;
@@ -45,7 +46,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected static final org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult AST_EDEFAULT = null;
+	protected static final AstResult AST_EDEFAULT = null;
 
 	/**
 	 * The cached value of the '{@link #getAst() <em>Ast</em>}' attribute.
@@ -55,7 +56,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult ast = AST_EDEFAULT;
+	protected AstResult ast = AST_EDEFAULT;
 
 	/**
 	 * The cached value of the '{@link #getAql() <em>Aql</em>}' containment reference.
@@ -92,7 +93,7 @@
 	 * @generated
 	 */
 	@Override
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getAst() {
+	public AstResult getAst() {
 		return ast;
 	}
 
@@ -102,8 +103,8 @@
 	 * @generated
 	 */
 	@Override
-	public void setAst(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult newAst) {
-		org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult oldAst = ast;
+	public void setAst(AstResult newAst) {
+		AstResult oldAst = ast;
 		ast = newAst;
 		if (eNotificationRequired())
 			eNotify(new ENotificationImpl(this, Notification.SET, AcceleoPackage.EXPRESSION__AST, oldAst,
@@ -202,7 +203,7 @@
 	public void eSet(int featureID, Object newValue) {
 		switch (featureID) {
 			case AcceleoPackage.EXPRESSION__AST:
-				setAst((org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)newValue);
+				setAst((AstResult)newValue);
 				return;
 			case AcceleoPackage.EXPRESSION__AQL:
 				setAql((org.eclipse.acceleo.query.ast.Expression)newValue);
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionStatementImpl.java
index 6131215..fe57d70 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ExpressionStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/FileStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/FileStatementImpl.java
index c44433a..10b943e 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/FileStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/FileStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ForStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ForStatementImpl.java
index 3c5bb4e..6c42d72 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ForStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ForStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/IfStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/IfStatementImpl.java
index 7fb4d4e..79e6513 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/IfStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/IfStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ImportImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ImportImpl.java
index f26cc66..c9bf41a 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ImportImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ImportImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LeafStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LeafStatementImpl.java
index 5fc0c41..20a2e89 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LeafStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LeafStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LetStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LetStatementImpl.java
index 079c772..6623fd0 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LetStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/LetStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/MetamodelImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/MetamodelImpl.java
index 389f68d..96a2e1f 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/MetamodelImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/MetamodelImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleDocumentationImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleDocumentationImpl.java
index eaac550..71f5972 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleDocumentationImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleDocumentationImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementDocumentationImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementDocumentationImpl.java
index ec503d0..ad575d9 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementDocumentationImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementDocumentationImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementImpl.java
index f5e815b..f3ed57a 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleElementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleImpl.java
index 9efd099..7df0d0c 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleReferenceImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleReferenceImpl.java
index 232ed7d..3cf3847 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleReferenceImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ModuleReferenceImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NamedElementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NamedElementImpl.java
index dcec333..6d6666a 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NamedElementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NamedElementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NewLineStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NewLineStatementImpl.java
index f87a00e..c3f8941 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NewLineStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/NewLineStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ParameterDocumentationImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ParameterDocumentationImpl.java
index f73c596..236dfb7 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ParameterDocumentationImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ParameterDocumentationImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ProtectedAreaImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ProtectedAreaImpl.java
index 6a5e6d3..3a56d6c 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ProtectedAreaImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/ProtectedAreaImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/QueryImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/QueryImpl.java
index 939d279..656077d 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/QueryImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/QueryImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -22,6 +22,7 @@
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.Variable;
 import org.eclipse.acceleo.VisibilityKind;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.notify.NotificationChain;
 import org.eclipse.emf.common.util.EList;
@@ -109,7 +110,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected static final org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult TYPE_EDEFAULT = null;
+	protected static final AstResult TYPE_EDEFAULT = null;
 
 	/**
 	 * The cached value of the '{@link #getType() <em>Type</em>}' attribute.
@@ -119,7 +120,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult type = TYPE_EDEFAULT;
+	protected AstResult type = TYPE_EDEFAULT;
 
 	/**
 	 * The cached value of the '{@link #getTypeAql() <em>Type Aql</em>}' containment reference. <!--
@@ -303,18 +304,17 @@
 	 * @generated
 	 */
 	@Override
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getType() {
+	public AstResult getType() {
 		return type;
 	}
 
 	/**
-	 * <!-- begin-user-doc -->
-	 * <!-- end-user-doc -->
+	 * <!-- begin-user-doc --> <!-- end-user-doc -->
 	 * @generated
 	 */
 	@Override
-	public void setType(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult newType) {
-		org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult oldType = type;
+	public void setType(AstResult newType) {
+		AstResult oldType = type;
 		type = newType;
 		if (eNotificationRequired())
 			eNotify(new ENotificationImpl(this, Notification.SET, AcceleoPackage.QUERY__TYPE, oldType, type));
@@ -536,7 +536,7 @@
 				setName((String)newValue);
 				return;
 			case AcceleoPackage.QUERY__TYPE:
-				setType((org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)newValue);
+				setType((AstResult)newValue);
 				return;
 			case AcceleoPackage.QUERY__TYPE_AQL:
 				setTypeAql((org.eclipse.acceleo.query.ast.Expression)newValue);
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TemplateImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TemplateImpl.java
index c1fa3cc..6f42908 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TemplateImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TemplateImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TextStatementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TextStatementImpl.java
index 5700efa..82dec9f 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TextStatementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TextStatementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TypedElementImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TypedElementImpl.java
index 704853b..457c532 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TypedElementImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/TypedElementImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -14,6 +14,7 @@
 import org.eclipse.acceleo.AcceleoPackage;
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.query.ast.Expression;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.notify.NotificationChain;
 import org.eclipse.emf.ecore.EClass;
@@ -43,7 +44,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected static final org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult TYPE_EDEFAULT = null;
+	protected static final AstResult TYPE_EDEFAULT = null;
 
 	/**
 	 * The cached value of the '{@link #getType() <em>Type</em>}' attribute.
@@ -53,7 +54,7 @@
 	 * @generated
 	 * @ordered
 	 */
-	protected org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult type = TYPE_EDEFAULT;
+	protected AstResult type = TYPE_EDEFAULT;
 
 	/**
 	 * The cached value of the '{@link #getTypeAql() <em>Type Aql</em>}' containment reference. <!--
@@ -87,18 +88,17 @@
 	 * @generated
 	 */
 	@Override
-	public org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult getType() {
+	public AstResult getType() {
 		return type;
 	}
 
 	/**
-	 * <!-- begin-user-doc -->
-	 * <!-- end-user-doc -->
+	 * <!-- begin-user-doc --> <!-- end-user-doc -->
 	 * @generated
 	 */
 	@Override
-	public void setType(org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult newType) {
-		org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult oldType = type;
+	public void setType(AstResult newType) {
+		AstResult oldType = type;
 		type = newType;
 		if (eNotificationRequired())
 			eNotify(new ENotificationImpl(this, Notification.SET, AcceleoPackage.TYPED_ELEMENT__TYPE, oldType,
@@ -190,7 +190,7 @@
 	public void eSet(int featureID, Object newValue) {
 		switch (featureID) {
 			case AcceleoPackage.TYPED_ELEMENT__TYPE:
-				setType((org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult)newValue);
+				setType((AstResult)newValue);
 				return;
 			case AcceleoPackage.TYPED_ELEMENT__TYPE_AQL:
 				setTypeAql((Expression)newValue);
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/VariableImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/VariableImpl.java
index 68e35a0..8cca1d0 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/VariableImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/impl/VariableImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoAdapterFactory.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoAdapterFactory.java
index 7c5833a..84261f6 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoAdapterFactory.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoAdapterFactory.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceFactoryImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceFactoryImpl.java
index 4969d11..e29be7c 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceFactoryImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceFactoryImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceImpl.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceImpl.java
index ea68e63..63d012c 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceImpl.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoResourceImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoSwitch.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoSwitch.java
index a901300..7a4735e 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoSwitch.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoSwitch.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoXMLProcessor.java b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoXMLProcessor.java
index 0bae0e5..06fc9d6 100644
--- a/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoXMLProcessor.java
+++ b/plugins/org.eclipse.acceleo.aql/src-gen/org/eclipse/acceleo/util/AcceleoXMLProcessor.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2008, 2021 Obeo.
+ * Copyright (c) 2008, 2020 Obeo.
  * 
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/evaluation/AcceleoEvaluator.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/evaluation/AcceleoEvaluator.java
index 13aed03..561b8e1 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/evaluation/AcceleoEvaluator.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/evaluation/AcceleoEvaluator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021  Obeo.
+ * Copyright (c) 2016, 2020  Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -46,8 +46,8 @@
 import org.eclipse.acceleo.TextStatement;
 import org.eclipse.acceleo.aql.AcceleoUtil;
 import org.eclipse.acceleo.aql.IAcceleoEnvironment;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 import org.eclipse.acceleo.query.runtime.QueryEvaluation;
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/AcceleoLocator.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/AcceleoLocator.java
index 504fec0..eaa9193 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/AcceleoLocator.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/AcceleoLocator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020, 2021 Obeo.
+ * Copyright (c) 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -20,7 +20,7 @@
 import org.eclipse.acceleo.aql.location.common.AbstractLocationLink;
 import org.eclipse.acceleo.aql.parser.AcceleoAstResult;
 import org.eclipse.acceleo.aql.parser.AcceleoAstUtils;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.namespace.IQualifiedNameLookupEngine;
 import org.eclipse.emf.ecore.EObject;
 
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlDefinitionLocator.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlDefinitionLocator.java
index 0296b6d..b6acecf 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlDefinitionLocator.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlDefinitionLocator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020, 2021 Obeo.
+ * Copyright (c) 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -28,10 +28,10 @@
 import org.eclipse.acceleo.query.ast.VariableDeclaration;
 import org.eclipse.acceleo.query.ast.util.AstSwitch;
 import org.eclipse.acceleo.query.parser.AstEvaluator;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.AstValidator;
 import org.eclipse.acceleo.query.parser.CombineIterator;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IService;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlLocator.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlLocator.java
index 28f1e66..a008280 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlLocator.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/location/aql/AqlLocator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020, 2021 Obeo.
+ * Copyright (c) 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -15,7 +15,7 @@
 import java.util.Objects;
 
 import org.eclipse.acceleo.aql.location.common.AbstractLocationLink;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.emf.ecore.EObject;
 
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoAstUtils.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoAstUtils.java
index a6fc798..3381d36 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoAstUtils.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoAstUtils.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020, 2021 Obeo.
+ * Copyright (c) 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -21,7 +21,7 @@
 import org.eclipse.acceleo.Module;
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.query.ast.VariableDeclaration;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.EPackage;
 import org.eclipse.emf.ecore.util.EcoreUtil.EqualityHelper;
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoParser.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoParser.java
index d1b6f1c..b3825e4 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoParser.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoParser.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016, 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -79,10 +79,10 @@
 import org.eclipse.acceleo.query.ast.AstPackage;
 import org.eclipse.acceleo.query.ast.ErrorTypeLiteral;
 import org.eclipse.acceleo.query.parser.AstBuilderListener;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.Positions;
 import org.eclipse.acceleo.query.parser.QueryLexer;
 import org.eclipse.acceleo.query.parser.QueryParser;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IReadOnlyQueryEnvironment;
 import org.eclipse.emf.common.util.BasicDiagnostic;
 import org.eclipse.emf.common.util.Diagnostic;
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationResult.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationResult.java
index 95a6001..5381184 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationResult.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationResult.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2021 Obeo.
+ * Copyright (c) 2017 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -21,7 +21,7 @@
 
 import org.eclipse.acceleo.ASTNode;
 import org.eclipse.acceleo.aql.parser.AcceleoAstResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IValidationMessage;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationUtils.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationUtils.java
index 02351af..de7a341 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationUtils.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/AcceleoValidationUtils.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020, 2021 Obeo.
+ * Copyright (c) 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -20,8 +20,8 @@
 
 import org.eclipse.acceleo.TypedElement;
 import org.eclipse.acceleo.Variable;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.AstValidator;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 import org.eclipse.acceleo.query.runtime.impl.ValidationServices;
diff --git a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/IAcceleoValidationResult.java b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/IAcceleoValidationResult.java
index 3fd1a2c..a212074 100644
--- a/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/IAcceleoValidationResult.java
+++ b/plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/validation/IAcceleoValidationResult.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2021 Obeo.
+ * Copyright (c) 2017 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -14,7 +14,7 @@
 
 import org.eclipse.acceleo.ASTNode;
 import org.eclipse.acceleo.aql.parser.AcceleoAstResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IValidationMessage;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 
@@ -33,8 +33,8 @@
 	AcceleoAstResult getAcceleoAstResult();
 
 	/**
-	 * Gets the {@link List} of all {@link IValidationMessage} for {@link IAcceleoValidationResult#getModule()
-	 * validated module}.
+	 * Gets the {@link List} of all {@link IValidationMessage} for
+	 * {@link IAcceleoValidationResult#getModule() validated module}.
 	 * 
 	 * @return the {@link List} of all {@link IValidationMessage} for
 	 *         {@link IAcceleoValidationResult#getModule() validated module}
diff --git a/query/plugins/org.eclipse.acceleo.query.doc/src/org/eclipse/acceleo/query/doc/internal/DocumentationGenerator.java b/query/plugins/org.eclipse.acceleo.query.doc/src/org/eclipse/acceleo/query/doc/internal/DocumentationGenerator.java
index 74a4dd0..317185d 100644
--- a/query/plugins/org.eclipse.acceleo.query.doc/src/org/eclipse/acceleo/query/doc/internal/DocumentationGenerator.java
+++ b/query/plugins/org.eclipse.acceleo.query.doc/src/org/eclipse/acceleo/query/doc/internal/DocumentationGenerator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -42,9 +42,8 @@
  * @author <a href="mailto:stephane.begaudeau@obeo.fr">Stephane Begaudeau</a>
  */
 public final class DocumentationGenerator {
-
 	/**
-	 * Some kind of marker.
+	 * 
 	 */
 	private static final String TRIGGER_TO_APPEND_STD_DOC = "<p>These sections are listing all the services of the standard library of AQL.</p>";
 
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegate.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegate.java
index 3a168eb..c1858a6 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegate.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegate.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -15,9 +15,9 @@
 import java.util.List;
 import java.util.Map;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.AcceleoQueryEvaluationException;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 import org.eclipse.acceleo.query.runtime.QueryEvaluation;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegateFactory.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegateFactory.java
index 0440625..14afb80 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegateFactory.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLInvocationDelegateFactory.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -14,8 +14,8 @@
 import java.util.List;
 
 import org.eclipse.acceleo.query.ast.AstPackage;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.QueryParsing;
 import org.eclipse.emf.ecore.EOperation;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegate.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegate.java
index ff9af14..209a71a 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegate.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegate.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -14,9 +14,9 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.AcceleoQueryEvaluationException;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 import org.eclipse.acceleo.query.runtime.QueryEvaluation;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegateFactory.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegateFactory.java
index 6685587..19c6978 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegateFactory.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLQueryDelegateFactory.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -12,8 +12,8 @@
 
 import java.util.Map;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.QueryParsing;
 import org.eclipse.emf.ecore.EClassifier;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegate.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegate.java
index 5e435d9..9e143de 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegate.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegate.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -13,8 +13,8 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 import org.eclipse.acceleo.query.runtime.QueryEvaluation;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegateFactory.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegateFactory.java
index 8246d79..3d60313 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegateFactory.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLSettingDelegateFactory.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -11,8 +11,8 @@
 package org.eclipse.acceleo.query.delegates;
 
 import org.eclipse.acceleo.query.ast.AstPackage;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.QueryParsing;
 import org.eclipse.emf.ecore.EStructuralFeature;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLValidationDelegate.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLValidationDelegate.java
index 0922745..1f3bab4 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLValidationDelegate.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/delegates/AQLValidationDelegate.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -13,9 +13,9 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 import org.eclipse.acceleo.query.runtime.QueryEvaluation;
@@ -46,8 +46,8 @@
 	 *      org.eclipse.emf.ecore.EObject, java.util.Map, org.eclipse.emf.ecore.EOperation, java.lang.String)
 	 */
 	@Override
-	public boolean validate(EClass eClass, EObject eObject, Map<Object, Object> context, EOperation invariant,
-			String expression) {
+	public boolean validate(EClass eClass, EObject eObject, Map<Object, Object> context,
+			EOperation invariant, String expression) {
 		return Boolean.TRUE.equals(evaluate(eObject, expression));
 	}
 
@@ -70,8 +70,8 @@
 	 *      java.lang.Object, java.util.Map, java.lang.String, java.lang.String)
 	 */
 	@Override
-	public boolean validate(EDataType eDataType, Object value, Map<Object, Object> context, String constraint,
-			String expression) {
+	public boolean validate(EDataType eDataType, Object value, Map<Object, Object> context,
+			String constraint, String expression) {
 		return Boolean.TRUE.equals(evaluate(value, expression));
 	}
 
@@ -102,8 +102,8 @@
 				for (Diagnostic child : evaluationResult.getDiagnostic().getChildren()) {
 					messages.append("\n" + child.getMessage());
 				}
-				throw new IllegalArgumentException("Unable to evaluate \"" + expression + "\"" + messages
-						.toString());
+				throw new IllegalArgumentException("Unable to evaluate \"" + expression + "\""
+						+ messages.toString());
 			}
 			return evaluationResult.getResult();
 		} else {
@@ -111,8 +111,7 @@
 			for (Diagnostic child : astResult.getDiagnostic().getChildren()) {
 				messages.append("\n" + child.getMessage());
 			}
-			throw new IllegalArgumentException("Unable to parse \"" + expression + "\"" + messages
-					.toString());
+			throw new IllegalArgumentException("Unable to parse \"" + expression + "\"" + messages.toString());
 		}
 
 	}
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstBuilderListener.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstBuilderListener.java
index 0e4db9e..c9286f8 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstBuilderListener.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstBuilderListener.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -109,7 +109,6 @@
 import org.eclipse.acceleo.query.parser.QueryParser.VariableDefinitionContext;
 import org.eclipse.acceleo.query.parser.QueryParser.XorContext;
 import org.eclipse.acceleo.query.runtime.AcceleoQueryEvaluationException;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IReadOnlyQueryEnvironment;
 import org.eclipse.emf.common.util.BasicDiagnostic;
 import org.eclipse.emf.common.util.Diagnostic;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstCompletor.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstCompletor.java
index a500bf9..7de12f0 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstCompletor.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstCompletor.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -35,7 +35,6 @@
 import org.eclipse.acceleo.query.ast.VariableDeclaration;
 import org.eclipse.acceleo.query.ast.util.AstSwitch;
 import org.eclipse.acceleo.query.runtime.ICompletionProposal;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IServiceCompletionProposal;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 import org.eclipse.acceleo.query.runtime.impl.CompletionServices;
@@ -104,8 +103,8 @@
 			result = doSwitch(errorToComplete);
 		} else {
 			// no need for variables here since "expression variable" can't be valid
-			final Set<IType> possibleTypes = validationResult.getPossibleTypes(validationResult.getAstResult()
-					.getAst());
+			final Set<IType> possibleTypes = validationResult.getPossibleTypes(validationResult
+					.getAstResult().getAst());
 			result = getExpressionTextFollows(possibleTypes);
 		}
 
@@ -269,8 +268,8 @@
 	public List<ICompletionProposal> caseErrorEnumLiteral(ErrorEnumLiteral object) {
 		final List<ICompletionProposal> result = new ArrayList<ICompletionProposal>();
 
-		result.addAll(services.getEEnumLiteralProposals(object.getSegments().get(0), object.getSegments().get(
-				1)));
+		result.addAll(services.getEEnumLiteralProposals(object.getSegments().get(0), object.getSegments()
+				.get(1)));
 
 		return result;
 	}
@@ -468,8 +467,8 @@
 	 * 
 	 * @param possibleTypes
 	 *            possible types of the {@link org.eclipse.acceleo.query.ast.Expression Expression}
-	 * @return the {@link TextCompletionProposal} following an {@link org.eclipse.acceleo.query.ast.Expression
-	 *         Expression}
+	 * @return the {@link TextCompletionProposal} following an
+	 *         {@link org.eclipse.acceleo.query.ast.Expression Expression}
 	 */
 	private List<ICompletionProposal> getExpressionTextFollows(Set<IType> possibleTypes) {
 		final List<ICompletionProposal> result = new ArrayList<ICompletionProposal>();
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstResult.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstResult.java
new file mode 100644
index 0000000..893ba32
--- /dev/null
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstResult.java
@@ -0,0 +1,421 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.acceleo.query.parser;
+
+import java.util.List;
+
+import org.eclipse.acceleo.query.ast.Error;
+import org.eclipse.acceleo.query.ast.Expression;
+import org.eclipse.acceleo.query.ast.VariableDeclaration;
+import org.eclipse.emf.common.util.Diagnostic;
+import org.eclipse.emf.ecore.EObject;
+
+/**
+ * Representation of an ast built.
+ * 
+ * @author <a href="mailto:yvan.lussaud@obeo.fr">Yvan Lussaud</a>
+ */
+public class AstResult {
+
+	/**
+	 * The built {@link Expression}.
+	 */
+	private final Expression ast;
+
+	/**
+	 * The {@link List} of {@link Error}.
+	 */
+	private final List<Error> errors;
+
+	/**
+	 * The positions of parsed elements.
+	 */
+	private final Positions positions;
+
+	/**
+	 * The {@link Diagnostic} of the parsing.
+	 */
+	private Diagnostic diagnostic;
+
+	/**
+	 * Constructor.
+	 * 
+	 * @param ast
+	 *            the built {@link Expression}
+	 * @param positions
+	 *            the {@link Positions} of parsed elements
+	 * @param errors
+	 *            the {@link List} of {@link Error}
+	 * @param diagnostic
+	 *            the {@link Diagnostic} of the parsing
+	 */
+	public AstResult(Expression ast, Positions positions, List<Error> errors, Diagnostic diagnostic) {
+		this.ast = ast;
+		this.positions = positions;
+		this.errors = errors;
+		this.diagnostic = diagnostic;
+	}
+
+	/**
+	 * Gets the built {@link Expression}.
+	 * 
+	 * @return the built {@link Expression}
+	 */
+	public Expression getAst() {
+		return ast;
+	}
+
+	/**
+	 * Gets the {@link List} of {@link Error}.
+	 * 
+	 * @return the {@link List} of {@link Error}
+	 */
+	public List<Error> getErrors() {
+		return errors;
+	}
+
+	/**
+	 * Gets the start position of the given {@link Expression} in the parsed text.
+	 * 
+	 * @param expression
+	 *            the {@link Expression}
+	 * @return the start position of the given {@link Expression} in the parsed text if any, <code>-1</code>
+	 *         otherwise
+	 */
+	public int getStartPosition(Expression expression) {
+		return getInternalStartPosition(expression);
+	}
+
+	/**
+	 * Gets the start position of the given {@link VariableDeclaration} in the parsed text.
+	 * 
+	 * @param declaration
+	 *            the {@link VariableDeclaration}
+	 * @return the start position of the given {@link VariableDeclaration} in the parsed text if any,
+	 *         <code>-1</code> otherwise
+	 */
+	public int getStartPosition(VariableDeclaration declaration) {
+		return getInternalStartPosition(declaration);
+	}
+
+	/**
+	 * Gets the start position of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 * text.
+	 * 
+	 * @param object
+	 *            the {@link Expression} or a {@link VariableDeclaration}
+	 * @return the start position of the given {@link Expression} or a {@link VariableDeclaration} in the
+	 *         parsed text if any, <code>-1</code> otherwise
+	 */
+	private int getInternalStartPosition(EObject object) {
+		final int res;
+
+		final Integer position = positions.getStartPositions(object);
+		if (position != null) {
+			res = position.intValue();
+		} else {
+			res = -1;
+		}
+
+		return res;
+	}
+
+	/**
+	 * Gets the start line of the given {@link Expression} in the parsed text.
+	 * 
+	 * @param expression
+	 *            the {@link Expression}
+	 * @return the start line of the given {@link Expression} in the parsed text if any, <code>-1</code>
+	 *         otherwise
+	 */
+	public int getStartLine(Expression expression) {
+		return getInternalStartLine(expression);
+	}
+
+	/**
+	 * Gets the start line of the given {@link VariableDeclaration} in the parsed text.
+	 * 
+	 * @param declaration
+	 *            the {@link VariableDeclaration}
+	 * @return the start line of the given {@link VariableDeclaration} in the parsed text if any,
+	 *         <code>-1</code> otherwise
+	 */
+	public int getStartLine(VariableDeclaration declaration) {
+		return getInternalStartLine(declaration);
+	}
+
+	/**
+	 * Gets the start line of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 * text.
+	 * 
+	 * @param object
+	 *            the {@link Expression} or a {@link VariableDeclaration}
+	 * @return the start line of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 *         text if any, <code>-1</code> otherwise
+	 */
+	private int getInternalStartLine(EObject object) {
+		final int res;
+
+		final Integer line = positions.getStartLines(object);
+		if (line != null) {
+			res = line.intValue();
+		} else {
+			res = -1;
+		}
+
+		return res;
+	}
+
+	/**
+	 * Gets the start column of the given {@link Expression} in the parsed text.
+	 * 
+	 * @param expression
+	 *            the {@link Expression}
+	 * @return the start column of the given {@link Expression} in the parsed text if any, <code>-1</code>
+	 *         otherwise
+	 */
+	public int getStartColumn(Expression expression) {
+		return getInternalStartColumn(expression);
+	}
+
+	/**
+	 * Gets the start column of the given {@link VariableDeclaration} in the parsed text.
+	 * 
+	 * @param declaration
+	 *            the {@link VariableDeclaration}
+	 * @return the start column of the given {@link VariableDeclaration} in the parsed text if any,
+	 *         <code>-1</code> otherwise
+	 */
+	public int getStartColumn(VariableDeclaration declaration) {
+		return getInternalStartColumn(declaration);
+	}
+
+	/**
+	 * Gets the start column of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 * text.
+	 * 
+	 * @param object
+	 *            the {@link Expression} or a {@link VariableDeclaration}
+	 * @return the start column of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 *         text if any, <code>-1</code> otherwise
+	 */
+	private int getInternalStartColumn(EObject object) {
+		final int res;
+
+		final Integer column = positions.getStartColumns(object);
+		if (column != null) {
+			res = column.intValue();
+		} else {
+			res = -1;
+		}
+
+		return res;
+	}
+
+	/**
+	 * Gets the end position of the given {@link Expression} in the parsed text.
+	 * 
+	 * @param expression
+	 *            the {@link Expression}
+	 * @return the end position of the given {@link Expression} in the parsed text if any, <code>-1</code>
+	 *         otherwise
+	 */
+	public int getEndPosition(Expression expression) {
+		return getInternalEndPosition(expression);
+	}
+
+	/**
+	 * Gets the end position of the given {@link VariableDeclaration} in the parsed text.
+	 * 
+	 * @param declaration
+	 *            the {@link VariableDeclaration}
+	 * @return the end position of the given {@link VariableDeclaration} in the parsed text if any,
+	 *         <code>-1</code> otherwise
+	 */
+	public int getEndPosition(VariableDeclaration declaration) {
+		return getInternalEndPosition(declaration);
+	}
+
+	/**
+	 * Gets the end position of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 * text.
+	 * 
+	 * @param object
+	 *            the {@link Expression} or a {@link VariableDeclaration}
+	 * @return the end position of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 *         text if any, <code>-1</code> otherwise
+	 */
+	private int getInternalEndPosition(EObject object) {
+		final int res;
+
+		final Integer position = positions.getEndPositions(object);
+		if (position != null) {
+			res = position.intValue();
+		} else {
+			res = -1;
+		}
+
+		return res;
+	}
+
+	/**
+	 * Gets the end line of the given {@link Expression} in the parsed text.
+	 * 
+	 * @param expression
+	 *            the {@link Expression}
+	 * @return the end line of the given {@link Expression} in the parsed text if any, <code>-1</code>
+	 *         otherwise
+	 */
+	public int getEndLine(Expression expression) {
+		return getInternalEndLine(expression);
+	}
+
+	/**
+	 * Gets the end line of the given {@link VariableDeclaration} in the parsed text.
+	 * 
+	 * @param declaration
+	 *            the {@link VariableDeclaration}
+	 * @return the end line of the given {@link VariableDeclaration} in the parsed text if any,
+	 *         <code>-1</code> otherwise
+	 */
+	public int getEndLine(VariableDeclaration declaration) {
+		return getInternalEndLine(declaration);
+	}
+
+	/**
+	 * Gets the end line of the given {@link Expression} or a {@link VariableDeclaration} in the parsed text.
+	 * 
+	 * @param object
+	 *            the {@link Expression} or a {@link VariableDeclaration}
+	 * @return the end line of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 *         text if any, <code>-1</code> otherwise
+	 */
+	private int getInternalEndLine(EObject object) {
+		final int res;
+
+		final Integer line = positions.getEndLines(object);
+		if (line != null) {
+			res = line.intValue();
+		} else {
+			res = -1;
+		}
+
+		return res;
+	}
+
+	/**
+	 * Gets the end column of the given {@link Expression} in the parsed text.
+	 * 
+	 * @param expression
+	 *            the {@link Expression}
+	 * @return the end column of the given {@link Expression} in the parsed text if any, <code>-1</code>
+	 *         otherwise
+	 */
+	public int getEndColumn(Expression expression) {
+		return getInternalEndColumn(expression);
+	}
+
+	/**
+	 * Gets the end column of the given {@link VariableDeclaration} in the parsed text.
+	 * 
+	 * @param declaration
+	 *            the {@link VariableDeclaration}
+	 * @return the end column of the given {@link VariableDeclaration} in the parsed text if any,
+	 *         <code>-1</code> otherwise
+	 */
+	public int getEndColumn(VariableDeclaration declaration) {
+		return getInternalEndColumn(declaration);
+	}
+
+	/**
+	 * Gets the end column of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 * text.
+	 * 
+	 * @param object
+	 *            the {@link Expression} or a {@link VariableDeclaration}
+	 * @return the end column of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
+	 *         text if any, <code>-1</code> otherwise
+	 */
+	private int getInternalEndColumn(EObject object) {
+		final int res;
+
+		final Integer column = positions.getEndColumns(object);
+		if (column != null) {
+			res = column.intValue();
+		} else {
+			res = -1;
+		}
+
+		return res;
+	}
+
+	/**
+	 * Add all the ast positions to the given {@link Positions} shifted by the given offset.
+	 * 
+	 * @param pos
+	 *            the {@link Positions}
+	 * @param offsetPosition
+	 *            the offset position
+	 * @param offsetLine
+	 *            the offset line
+	 * @param offsetColumn
+	 *            the offset column
+	 */
+	public void addAllPositonsTo(Positions pos, int offsetPosition, int offsetLine, int offsetColumn) {
+		pos.addAll(this.positions, offsetPosition, offsetLine, offsetColumn);
+	}
+
+	/**
+	 * Gets the {@link Diagnostic} of the parsing.
+	 * 
+	 * @return the {@link Diagnostic} of the parsing
+	 */
+	public Diagnostic getDiagnostic() {
+		return diagnostic;
+	}
+
+	/**
+	 * Creates an {@link AstResult} for the given {@link Expression sub AST}.
+	 * 
+	 * @param subAst
+	 *            the sub part of {@link Expression AST}
+	 * @return a new {@link AstResult} for the given {@link Expression sub AST}
+	 * @since 4.1
+	 */
+	public AstResult subResult(Expression subAst) {
+		return new AstResult(subAst, positions, errors, diagnostic);
+	}
+
+	/**
+	 * Gets the ast node at the given position.
+	 * 
+	 * @param position
+	 *            the position
+	 * @return the ast node at the given position if any, <code>null</code> otherwise
+	 */
+	public EObject getAstNode(int position) {
+		return positions.getNodeAt(ast, position);
+	}
+
+	/**
+	 * Gets the ast node at the given line and column.
+	 * 
+	 * @param line
+	 *            the start line
+	 * @param column
+	 *            the start column
+	 * @return the ast node at the given line and column if nay, <code>null</code> otherwise
+	 */
+	public EObject getAstNode(int line, int column) {
+		return positions.getNodeAt(ast, line, column);
+	}
+
+}
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstValidator.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstValidator.java
index 6937954..550850e 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstValidator.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/parser/AstValidator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015, 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -47,7 +47,6 @@
 import org.eclipse.acceleo.query.ast.VarRef;
 import org.eclipse.acceleo.query.ast.VariableDeclaration;
 import org.eclipse.acceleo.query.ast.util.AstSwitch;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IReadOnlyQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IValidationMessage;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryBuilderEngine.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryBuilderEngine.java
index 4cf616f..147ec8d 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryBuilderEngine.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryBuilderEngine.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -10,14 +10,7 @@
  *******************************************************************************/
 package org.eclipse.acceleo.query.runtime;
 
-import java.util.List;
-
-import org.eclipse.acceleo.query.ast.Error;
-import org.eclipse.acceleo.query.ast.Expression;
-import org.eclipse.acceleo.query.ast.VariableDeclaration;
-import org.eclipse.acceleo.query.parser.Positions;
-import org.eclipse.emf.common.util.Diagnostic;
-import org.eclipse.emf.ecore.EObject;
+import org.eclipse.acceleo.query.parser.AstResult;
 
 /**
  * / Evaluation Engine is used to evaluate acceleo expressions. The evaluation engine allows to register
@@ -28,409 +21,6 @@
 public interface IQueryBuilderEngine extends IQueryEngine {
 
 	/**
-	 * Representation of an ast built.
-	 * 
-	 * @author <a href="mailto:yvan.lussaud@obeo.fr">Yvan Lussaud</a>
-	 */
-	class AstResult {
-
-		/**
-		 * The built {@link Expression}.
-		 */
-		private final Expression ast;
-
-		/**
-		 * The {@link List} of {@link Error}.
-		 */
-		private final List<Error> errors;
-
-		/**
-		 * The positions of parsed elements.
-		 */
-		private final Positions positions;
-
-		/**
-		 * The {@link Diagnostic} of the parsing.
-		 */
-		private Diagnostic diagnostic;
-
-		/**
-		 * Constructor.
-		 * 
-		 * @param ast
-		 *            the built {@link Expression}
-		 * @param positions
-		 *            the {@link Positions} of parsed elements
-		 * @param errors
-		 *            the {@link List} of {@link Error}
-		 * @param diagnostic
-		 *            the {@link Diagnostic} of the parsing
-		 */
-		public AstResult(Expression ast, Positions positions, List<Error> errors, Diagnostic diagnostic) {
-			this.ast = ast;
-			this.positions = positions;
-			this.errors = errors;
-			this.diagnostic = diagnostic;
-		}
-
-		/**
-		 * Gets the built {@link Expression}.
-		 * 
-		 * @return the built {@link Expression}
-		 */
-		public Expression getAst() {
-			return ast;
-		}
-
-		/**
-		 * Gets the {@link List} of {@link Error}.
-		 * 
-		 * @return the {@link List} of {@link Error}
-		 */
-		public List<Error> getErrors() {
-			return errors;
-		}
-
-		/**
-		 * Gets the start position of the given {@link Expression} in the parsed text.
-		 * 
-		 * @param expression
-		 *            the {@link Expression}
-		 * @return the start position of the given {@link Expression} in the parsed text if any,
-		 *         <code>-1</code> otherwise
-		 */
-		public int getStartPosition(Expression expression) {
-			return getInternalStartPosition(expression);
-		}
-
-		/**
-		 * Gets the start position of the given {@link VariableDeclaration} in the parsed text.
-		 * 
-		 * @param declaration
-		 *            the {@link VariableDeclaration}
-		 * @return the start position of the given {@link VariableDeclaration} in the parsed text if any,
-		 *         <code>-1</code> otherwise
-		 */
-		public int getStartPosition(VariableDeclaration declaration) {
-			return getInternalStartPosition(declaration);
-		}
-
-		/**
-		 * Gets the start position of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 * parsed text.
-		 * 
-		 * @param object
-		 *            the {@link Expression} or a {@link VariableDeclaration}
-		 * @return the start position of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 *         parsed text if any, <code>-1</code> otherwise
-		 */
-		private int getInternalStartPosition(EObject object) {
-			final int res;
-
-			final Integer position = positions.getStartPositions(object);
-			if (position != null) {
-				res = position.intValue();
-			} else {
-				res = -1;
-			}
-
-			return res;
-		}
-
-		/**
-		 * Gets the start line of the given {@link Expression} in the parsed text.
-		 * 
-		 * @param expression
-		 *            the {@link Expression}
-		 * @return the start line of the given {@link Expression} in the parsed text if any, <code>-1</code>
-		 *         otherwise
-		 */
-		public int getStartLine(Expression expression) {
-			return getInternalStartLine(expression);
-		}
-
-		/**
-		 * Gets the start line of the given {@link VariableDeclaration} in the parsed text.
-		 * 
-		 * @param declaration
-		 *            the {@link VariableDeclaration}
-		 * @return the start line of the given {@link VariableDeclaration} in the parsed text if any,
-		 *         <code>-1</code> otherwise
-		 */
-		public int getStartLine(VariableDeclaration declaration) {
-			return getInternalStartLine(declaration);
-		}
-
-		/**
-		 * Gets the start line of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
-		 * text.
-		 * 
-		 * @param object
-		 *            the {@link Expression} or a {@link VariableDeclaration}
-		 * @return the start line of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 *         parsed text if any, <code>-1</code> otherwise
-		 */
-		private int getInternalStartLine(EObject object) {
-			final int res;
-
-			final Integer line = positions.getStartLines(object);
-			if (line != null) {
-				res = line.intValue();
-			} else {
-				res = -1;
-			}
-
-			return res;
-		}
-
-		/**
-		 * Gets the start column of the given {@link Expression} in the parsed text.
-		 * 
-		 * @param expression
-		 *            the {@link Expression}
-		 * @return the start column of the given {@link Expression} in the parsed text if any, <code>-1</code>
-		 *         otherwise
-		 */
-		public int getStartColumn(Expression expression) {
-			return getInternalStartColumn(expression);
-		}
-
-		/**
-		 * Gets the start column of the given {@link VariableDeclaration} in the parsed text.
-		 * 
-		 * @param declaration
-		 *            the {@link VariableDeclaration}
-		 * @return the start column of the given {@link VariableDeclaration} in the parsed text if any,
-		 *         <code>-1</code> otherwise
-		 */
-		public int getStartColumn(VariableDeclaration declaration) {
-			return getInternalStartColumn(declaration);
-		}
-
-		/**
-		 * Gets the start column of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 * parsed text.
-		 * 
-		 * @param object
-		 *            the {@link Expression} or a {@link VariableDeclaration}
-		 * @return the start column of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 *         parsed text if any, <code>-1</code> otherwise
-		 */
-		private int getInternalStartColumn(EObject object) {
-			final int res;
-
-			final Integer column = positions.getStartColumns(object);
-			if (column != null) {
-				res = column.intValue();
-			} else {
-				res = -1;
-			}
-
-			return res;
-		}
-
-		/**
-		 * Gets the end position of the given {@link Expression} in the parsed text.
-		 * 
-		 * @param expression
-		 *            the {@link Expression}
-		 * @return the end position of the given {@link Expression} in the parsed text if any, <code>-1</code>
-		 *         otherwise
-		 */
-		public int getEndPosition(Expression expression) {
-			return getInternalEndPosition(expression);
-		}
-
-		/**
-		 * Gets the end position of the given {@link VariableDeclaration} in the parsed text.
-		 * 
-		 * @param declaration
-		 *            the {@link VariableDeclaration}
-		 * @return the end position of the given {@link VariableDeclaration} in the parsed text if any,
-		 *         <code>-1</code> otherwise
-		 */
-		public int getEndPosition(VariableDeclaration declaration) {
-			return getInternalEndPosition(declaration);
-		}
-
-		/**
-		 * Gets the end position of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 * parsed text.
-		 * 
-		 * @param object
-		 *            the {@link Expression} or a {@link VariableDeclaration}
-		 * @return the end position of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 *         parsed text if any, <code>-1</code> otherwise
-		 */
-		private int getInternalEndPosition(EObject object) {
-			final int res;
-
-			final Integer position = positions.getEndPositions(object);
-			if (position != null) {
-				res = position.intValue();
-			} else {
-				res = -1;
-			}
-
-			return res;
-		}
-
-		/**
-		 * Gets the end line of the given {@link Expression} in the parsed text.
-		 * 
-		 * @param expression
-		 *            the {@link Expression}
-		 * @return the end line of the given {@link Expression} in the parsed text if any, <code>-1</code>
-		 *         otherwise
-		 */
-		public int getEndLine(Expression expression) {
-			return getInternalEndLine(expression);
-		}
-
-		/**
-		 * Gets the end line of the given {@link VariableDeclaration} in the parsed text.
-		 * 
-		 * @param declaration
-		 *            the {@link VariableDeclaration}
-		 * @return the end line of the given {@link VariableDeclaration} in the parsed text if any,
-		 *         <code>-1</code> otherwise
-		 */
-		public int getEndLine(VariableDeclaration declaration) {
-			return getInternalEndLine(declaration);
-		}
-
-		/**
-		 * Gets the end line of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
-		 * text.
-		 * 
-		 * @param object
-		 *            the {@link Expression} or a {@link VariableDeclaration}
-		 * @return the end line of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
-		 *         text if any, <code>-1</code> otherwise
-		 */
-		private int getInternalEndLine(EObject object) {
-			final int res;
-
-			final Integer line = positions.getEndLines(object);
-			if (line != null) {
-				res = line.intValue();
-			} else {
-				res = -1;
-			}
-
-			return res;
-		}
-
-		/**
-		 * Gets the end column of the given {@link Expression} in the parsed text.
-		 * 
-		 * @param expression
-		 *            the {@link Expression}
-		 * @return the end column of the given {@link Expression} in the parsed text if any, <code>-1</code>
-		 *         otherwise
-		 */
-		public int getEndColumn(Expression expression) {
-			return getInternalEndColumn(expression);
-		}
-
-		/**
-		 * Gets the end column of the given {@link VariableDeclaration} in the parsed text.
-		 * 
-		 * @param declaration
-		 *            the {@link VariableDeclaration}
-		 * @return the end column of the given {@link VariableDeclaration} in the parsed text if any,
-		 *         <code>-1</code> otherwise
-		 */
-		public int getEndColumn(VariableDeclaration declaration) {
-			return getInternalEndColumn(declaration);
-		}
-
-		/**
-		 * Gets the end column of the given {@link Expression} or a {@link VariableDeclaration} in the parsed
-		 * text.
-		 * 
-		 * @param object
-		 *            the {@link Expression} or a {@link VariableDeclaration}
-		 * @return the end column of the given {@link Expression} or a {@link VariableDeclaration} in the
-		 *         parsed text if any, <code>-1</code> otherwise
-		 */
-		private int getInternalEndColumn(EObject object) {
-			final int res;
-
-			final Integer column = positions.getEndColumns(object);
-			if (column != null) {
-				res = column.intValue();
-			} else {
-				res = -1;
-			}
-
-			return res;
-		}
-
-		/**
-		 * Add all the ast positions to the given {@link Positions} shifted by the given offset.
-		 * 
-		 * @param pos
-		 *            the {@link Positions}
-		 * @param offsetPosition
-		 *            the offset position
-		 * @param offsetLine
-		 *            the offset line
-		 * @param offsetColumn
-		 *            the offset column
-		 */
-		public void addAllPositonsTo(Positions pos, int offsetPosition, int offsetLine, int offsetColumn) {
-			pos.addAll(this.positions, offsetPosition, offsetLine, offsetColumn);
-		}
-
-		/**
-		 * Gets the {@link Diagnostic} of the parsing.
-		 * 
-		 * @return the {@link Diagnostic} of the parsing
-		 */
-		public Diagnostic getDiagnostic() {
-			return diagnostic;
-		}
-
-		/**
-		 * Creates an {@link AstResult} for the given {@link Expression sub AST}.
-		 * 
-		 * @param subAst
-		 *            the sub part of {@link Expression AST}
-		 * @return a new {@link AstResult} for the given {@link Expression sub AST}
-		 * @since 4.1
-		 */
-		public AstResult subResult(Expression subAst) {
-			return new AstResult(subAst, positions, errors, diagnostic);
-		}
-
-		/**
-		 * Gets the ast node at the given position.
-		 * 
-		 * @param position
-		 *            the position
-		 * @return the ast node at the given position if any, <code>null</code> otherwise
-		 */
-		public EObject getAstNode(int position) {
-			return positions.getNodeAt(ast, position);
-		}
-
-		/**
-		 * Gets the ast node at the given line and column.
-		 * 
-		 * @param line
-		 *            the start line
-		 * @param column
-		 *            the start column
-		 * @return the ast node at the given line and column if nay, <code>null</code> otherwise
-		 */
-		public EObject getAstNode(int line, int column) {
-			return positions.getNodeAt(ast, line, column);
-		}
-
-	}
-
-	/**
 	 * Builds the specified expression.
 	 * 
 	 * @param expression
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryEvaluationEngine.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryEvaluationEngine.java
index bca1339..d38841f 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryEvaluationEngine.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IQueryEvaluationEngine.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -12,7 +12,7 @@
 
 import java.util.Map;
 
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 
 /**
  * / Evaluation Engine is used to evaluate acceleo expressions. The evaluation engine allows to register
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IValidationResult.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IValidationResult.java
index 04b902c..21330a9 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IValidationResult.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/IValidationResult.java
@@ -1,5 +1,15 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+/*******************************************************************************
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -15,7 +25,7 @@
 import java.util.Set;
 
 import org.eclipse.acceleo.query.ast.Expression;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.validation.type.IType;
 
 /**
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryBuilderEngine.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryBuilderEngine.java
index 1e69660..b7be5d7 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryBuilderEngine.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryBuilderEngine.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -27,6 +27,7 @@
 import org.eclipse.acceleo.query.ast.Error;
 import org.eclipse.acceleo.query.ast.ErrorExpression;
 import org.eclipse.acceleo.query.parser.AstBuilderListener;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.Positions;
 import org.eclipse.acceleo.query.parser.QueryLexer;
 import org.eclipse.acceleo.query.parser.QueryParser;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryEvaluationEngine.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryEvaluationEngine.java
index 67f37a1..bc0a09a 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryEvaluationEngine.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryEvaluationEngine.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -14,9 +14,9 @@
 
 import org.eclipse.acceleo.query.ast.Expression;
 import org.eclipse.acceleo.query.parser.AstEvaluator;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.AcceleoQueryEvaluationException;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryValidationEngine.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryValidationEngine.java
index ee3ec3f..d22c9cf 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryValidationEngine.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/QueryValidationEngine.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -13,9 +13,9 @@
 import java.util.Map;
 import java.util.Set;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.AstValidator;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryValidationEngine;
 import org.eclipse.acceleo.query.runtime.IReadOnlyQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/ValidationResult.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/ValidationResult.java
index a99f969..ea77e56 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/ValidationResult.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/ValidationResult.java
@@ -1,5 +1,15 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+/*******************************************************************************
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -18,14 +28,15 @@
 import java.util.Set;
 
 import org.eclipse.acceleo.query.ast.Expression;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IValidationMessage;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 import org.eclipse.acceleo.query.validation.type.IType;
 
 /**
- * Result of a {@link org.eclipse.acceleo.query.runtime.IQueryValidationEngine#validate(String, java.util.Map)
- * validation}.
+ * Result of a
+ * {@link org.eclipse.acceleo.query.runtime.IQueryValidationEngine#validate(String, java.util.Map) validation}
+ * .
  * 
  * @author <a href="mailto:yvan.lussaud@obeo.fr">Yvan Lussaud</a>
  */
diff --git a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/namespace/AbstractQualifiedNameService.java b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/namespace/AbstractQualifiedNameService.java
index 6673fdd..5ac9d54 100644
--- a/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/namespace/AbstractQualifiedNameService.java
+++ b/query/plugins/org.eclipse.acceleo.query/src/org/eclipse/acceleo/query/runtime/impl/namespace/AbstractQualifiedNameService.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -21,8 +21,6 @@
  * {@link IQualifiedNameLookupEngine#pushContext(String) push imports},
  * {@link IQualifiedNameLookupEngine#popContext(String) pop}.
  * 
- * @param <O>
- *            the origin type of the service
  * @author <a href="mailto:yvan.lussaud@obeo.fr">Yvan Lussaud</a>
  */
 public abstract class AbstractQualifiedNameService<O> extends AbstractService<O> {
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/BuildTest.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/BuildTest.java
index 1903a77..4e67814 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/BuildTest.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/BuildTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -44,7 +44,7 @@
 import org.eclipse.acceleo.query.ast.VarRef;
 import org.eclipse.acceleo.query.ast.VariableDeclaration;
 import org.eclipse.acceleo.query.parser.AstBuilderListener;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.Query;
 import org.eclipse.acceleo.query.runtime.impl.QueryBuilderEngine;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/PositionsTests.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/PositionsTests.java
index 26f39e2..82ab012 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/PositionsTests.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/parser/tests/PositionsTests.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020, 2021 Obeo.
+ * Copyright (c) 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -12,7 +12,7 @@
 
 import org.eclipse.acceleo.query.ast.Or;
 import org.eclipse.acceleo.query.ast.VarRef;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.Query;
 import org.eclipse.acceleo.query.runtime.impl.QueryBuilderEngine;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/AnyServicesAstValidationTest.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/AnyServicesAstValidationTest.java
index bd59a5d..caad45f 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/AnyServicesAstValidationTest.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/AnyServicesAstValidationTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -14,8 +14,8 @@
 import java.util.Iterator;
 import java.util.Set;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.tests.ValidationTest;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 import org.eclipse.acceleo.query.runtime.ValidationMessageLevel;
 import org.eclipse.acceleo.query.validation.type.IType;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/BooleanServicesAstValidationTest.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/BooleanServicesAstValidationTest.java
index fd2aacc..bb42ebb 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/BooleanServicesAstValidationTest.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/BooleanServicesAstValidationTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -14,8 +14,8 @@
 import java.util.Iterator;
 import java.util.Set;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.tests.ValidationTest;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 import org.eclipse.acceleo.query.runtime.ValidationMessageLevel;
 import org.eclipse.acceleo.query.validation.type.IType;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesAstValidationTest.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesAstValidationTest.java
index ce37157..336c15a 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesAstValidationTest.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesAstValidationTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -17,8 +17,8 @@
 import java.util.Map;
 import java.util.Set;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.tests.ValidationTest;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 import org.eclipse.acceleo.query.runtime.ValidationMessageLevel;
 import org.eclipse.acceleo.query.validation.type.IType;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesTest.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesTest.java
index 543f6ea..044ea94 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesTest.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/CollectionServicesTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -24,9 +24,9 @@
 
 import org.eclipse.acceleo.query.ast.Lambda;
 import org.eclipse.acceleo.query.parser.AstEvaluator;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 import org.eclipse.acceleo.query.runtime.Query;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/ComparableServicesAstValidationTest.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/ComparableServicesAstValidationTest.java
index 3c652e4..a53323d 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/ComparableServicesAstValidationTest.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/ComparableServicesAstValidationTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -13,8 +13,8 @@
 import java.util.Collections;
 import java.util.Set;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.tests.ValidationTest;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
 import org.eclipse.acceleo.query.runtime.ValidationMessageLevel;
 import org.eclipse.acceleo.query.validation.type.IType;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/EObjectServicesPerformanceTest.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/EObjectServicesPerformanceTest.java
index 5bc582d..51a9e56 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/EObjectServicesPerformanceTest.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/services/tests/EObjectServicesPerformanceTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Obeo.
+ * Copyright (c) 2016 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -21,9 +21,9 @@
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.runtime.EvaluationResult;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IQueryEnvironment;
 import org.eclipse.acceleo.query.runtime.IQueryEvaluationEngine;
 import org.eclipse.acceleo.query.runtime.Query;
diff --git a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/tests/AcceleoQueryInterpreter.java b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/tests/AcceleoQueryInterpreter.java
index 38de734..88b7fc4 100644
--- a/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/tests/AcceleoQueryInterpreter.java
+++ b/query/tests/org.eclipse.acceleo.query.tests/src/org/eclipse/acceleo/query/tests/AcceleoQueryInterpreter.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015, 2021 Obeo.
+ * Copyright (c) 2015 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -18,9 +18,9 @@
 import java.util.logging.Logger;
 
 import org.eclipse.acceleo.query.parser.AstEvaluator;
+import org.eclipse.acceleo.query.parser.AstResult;
 import org.eclipse.acceleo.query.parser.AstValidator;
 import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine;
-import org.eclipse.acceleo.query.runtime.IQueryBuilderEngine.AstResult;
 import org.eclipse.acceleo.query.runtime.IService;
 import org.eclipse.acceleo.query.runtime.IValidationMessage;
 import org.eclipse.acceleo.query.runtime.IValidationResult;
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/invalidAQLExpression/invalidAQLExpression-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/invalidAQLExpression/invalidAQLExpression-expected-runtimeMessages.txt
index b2b2bb6..15c9924 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/invalidAQLExpression/invalidAQLExpression-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/invalidAQLExpression/invalidAQLExpression-expected-runtimeMessages.txt
@@ -1,5 +1,5 @@
  (null 0 4) null[]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EPackage)' service[null]
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/templateCallWithPostErrorExpression/templateCallWithPostErrorExpression-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/templateCallWithPostErrorExpression/templateCallWithPostErrorExpression-expected-runtimeMessages.txt
index af6a093..0004d01 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/templateCallWithPostErrorExpression/templateCallWithPostErrorExpression-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/expressionStatement/templateCallWithPostErrorExpression/templateCallWithPostErrorExpression-expected-runtimeMessages.txt
@@ -1,6 +1,6 @@
  (null 0 4) null[]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(self, anydsl
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(self, anydsl
 ), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(java.lang.String)' service[null]
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementNull/forStatementNull-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementNull/forStatementNull-expected-runtimeMessages.txt
index be39c7f..2bf721e 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementNull/forStatementNull-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementNull/forStatementNull-expected-runtimeMessages.txt
@@ -1,2 +1,2 @@
  (null 0 2) null[]
-   (org.eclipse.acceleo.aql 0 2) The expression should not be null[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) The expression should not be null[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementWithSeparatorinvalidExpression/forStatementWithSeparatorinvalidExpression-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementWithSeparatorinvalidExpression/forStatementWithSeparatorinvalidExpression-expected-runtimeMessages.txt
index 6cf0211..9665a5c 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementWithSeparatorinvalidExpression/forStatementWithSeparatorinvalidExpression-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/forStatement/forStatementWithSeparatorinvalidExpression/forStatementWithSeparatorinvalidExpression-expected-runtimeMessages.txt
@@ -1,89 +1,89 @@
  (null 0 4) null[]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: MultiNamedElement) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: MultiNamedElement) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: NamedElement) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: NamedElement) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Producer) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Producer) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Adress) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Adress) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Company) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Company) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: ProductionCompany) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: ProductionCompany) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Restaurant) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Restaurant) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Chef) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Chef) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Recipe) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Recipe) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Food) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Food) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Source) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Source) (instanceClassName: null) (abstract: true, interface: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Plant) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Plant) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Animal) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: Animal) (instanceClassName: null) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Color) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Color) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EEnum)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Caliber) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Caliber) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EEnum)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Group) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Group) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EEnum)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Continent) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Continent) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EEnum)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Kind) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Kind) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EEnum)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Part) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EEnumImpl@00000000 (name: Part) (instanceClassName: null) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EEnum)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EDataTypeImpl@00000000 (name: CountryData) (instanceClassName: anydsl.Country) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EDataTypeImpl@00000000 (name: CountryData) (instanceClassName: anydsl.Country) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EDataType)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EDataTypeImpl@00000000 (name: SingleString) (instanceClassName: java.lang.String) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EDataTypeImpl@00000000 (name: SingleString) (instanceClassName: java.lang.String) (serializable: true)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EDataType)' service[null]
-   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 ]
+   (org.eclipse.acceleo.aql 0 4) AQL parsing issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 ]
      (org.eclipse.acceleo.query 0 4) missing feature access or service call[org.eclipse.acceleo.query.ast.impl.ErrorCallImpl@00000000 (serviceName: aqlFeatureAccess, type: CALLORAPPLY, missingEndParenthesis: false)]
-   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: EStringToRecipeMap) (instanceClassName: java.util.Map$Entry) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) AQL evaluation issue[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myVariable, org.eclipse.emf.ecore.impl.EClassImpl@00000000 (name: EStringToRecipeMap) (instanceClassName: java.util.Map$Entry) (abstract: false, interface: false)), (myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
      (org.eclipse.acceleo.query 0 2) Couldn't find the 'aqlFeatureAccess(EClassifier=EClass)' service[null]
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementElseIfNotBoolean/ifStatementElseIfNotBoolean-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementElseIfNotBoolean/ifStatementElseIfNotBoolean-expected-runtimeMessages.txt
index d6d35c6..a7da616 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementElseIfNotBoolean/ifStatementElseIfNotBoolean-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementElseIfNotBoolean/ifStatementElseIfNotBoolean-expected-runtimeMessages.txt
@@ -1,2 +1,2 @@
  (null 0 4) null[]
-   (org.eclipse.acceleo.aql 0 4) The expression must be evaluated to a boolean not: [org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 4) The expression must be evaluated to a boolean not: [org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementSecondElseIfNotBoolean/ifStatementSecondElseIfNotBoolean-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementSecondElseIfNotBoolean/ifStatementSecondElseIfNotBoolean-expected-runtimeMessages.txt
index d6d35c6..a7da616 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementSecondElseIfNotBoolean/ifStatementSecondElseIfNotBoolean-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementSecondElseIfNotBoolean/ifStatementSecondElseIfNotBoolean-expected-runtimeMessages.txt
@@ -1,2 +1,2 @@
  (null 0 4) null[]
-   (org.eclipse.acceleo.aql 0 4) The expression must be evaluated to a boolean not: [org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 4) The expression must be evaluated to a boolean not: [org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementThenNotBoolean/ifStatementThenNotBoolean-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementThenNotBoolean/ifStatementThenNotBoolean-expected-runtimeMessages.txt
index d6d35c6..a7da616 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementThenNotBoolean/ifStatementThenNotBoolean-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/ifStatement/ifStatementThenNotBoolean/ifStatementThenNotBoolean-expected-runtimeMessages.txt
@@ -1,2 +1,2 @@
  (null 0 4) null[]
-   (org.eclipse.acceleo.aql 0 4) The expression must be evaluated to a boolean not: [org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 4) The expression must be evaluated to a boolean not: [org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
diff --git a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/textStatement/textStatement_InvalidCharset/textStatement_InvalidCharset-expected-runtimeMessages.txt b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/textStatement/textStatement_InvalidCharset/textStatement_InvalidCharset-expected-runtimeMessages.txt
index 9b78be5..76692a3 100644
--- a/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/textStatement/textStatement_InvalidCharset/textStatement_InvalidCharset-expected-runtimeMessages.txt
+++ b/tests/org.eclipse.acceleo.aql.tests/resources/evaluation/textStatement/textStatement_InvalidCharset/textStatement_InvalidCharset-expected-runtimeMessages.txt
@@ -1,2 +1,2 @@
  (null 0 2) null[]
-   (org.eclipse.acceleo.aql 0 2) InvalidCharset fallback to UTF-8[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.runtime.IQueryBuilderEngine$AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]
+   (org.eclipse.acceleo.aql 0 2) InvalidCharset fallback to UTF-8[org.eclipse.acceleo.impl.ExpressionImpl@00000000 (ast: org.eclipse.acceleo.query.parser.AstResult@00000000 [(myParam, org.eclipse.emf.ecore.impl.EPackageImpl@00000000 (name: anydsl) (nsURI: http://www.eclipse.org/acceleo/anydsl, nsPrefix: anydsl)), ]]