bug 243466: [CommonNavigator] documentation missing about how to configure linkHelper
diff --git a/bundles/org.eclipse.ui.navigator/schema/linkHelper.exsd b/bundles/org.eclipse.ui.navigator/schema/linkHelper.exsd
index 20b1b64..ac24449 100644
--- a/bundles/org.eclipse.ui.navigator/schema/linkHelper.exsd
+++ b/bundles/org.eclipse.ui.navigator/schema/linkHelper.exsd
@@ -6,7 +6,7 @@
          <meta.schema plugin="org.eclipse.ui.navigator" id="linkHelper" name="Navigator Link Helper"/>
       </appInfo>
       <documentation>
-         Provides a hook for clients that wish to extend the &quot;Link with Editor&quot; capability of a Common Navigator.
+         Provides a hook for clients that wish to extend the &quot;Link with Editor&quot; capability of a Common Navigator.  A link helper must be included in a &lt;b&gt;viewerContentBinding&lt;/b&gt; element of the &lt;b&gt;org.eclipse.ui.navigator.viewer&lt;/b&gt; extension point.
       </documentation>
    </annotation>
 
@@ -70,7 +70,7 @@
    <element name="editorInputEnablement">
       <annotation>
          <documentation>
-            An Eclipse Core Expression that describes when this helper can provide a selection from an editor input. 
+            An Eclipse Core Expression that describes when this helper can provide a selection from an editor input.
          </documentation>
       </annotation>
       <complexType>
@@ -131,8 +131,7 @@
          <meta.section type="examples"/>
       </appInfo>
       <documentation>
-         
-&lt;pre&gt;
+         &lt;pre&gt;
     &lt;extension
           point=&quot;org.eclipse.ui.navigator.linkHelper&quot;&gt;
        &lt;linkHelper
@@ -155,7 +154,7 @@
          <meta.section type="apiInfo"/>
       </appInfo>
       <documentation>
-         
+
       </documentation>
    </annotation>
 
@@ -173,7 +172,7 @@
          <meta.section type="copyright"/>
       </appInfo>
       <documentation>
-         Copyright (c) 2002, 2006 IBM Corporation and others.&lt;br&gt;
+         Copyright (c) 2002, 2008 IBM Corporation and others.&lt;br&gt;
 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 &lt;a 
diff --git a/bundles/org.eclipse.ui.navigator/schema/viewer.exsd b/bundles/org.eclipse.ui.navigator/schema/viewer.exsd
index d299510..dfcaef9 100644
--- a/bundles/org.eclipse.ui.navigator/schema/viewer.exsd
+++ b/bundles/org.eclipse.ui.navigator/schema/viewer.exsd
@@ -15,8 +15,9 @@
 &lt;p&gt;
 &lt;b&gt;viewerContentBinding&lt;/b&gt; binds defined content extensions (through the &lt;b&gt;navigatorContent&lt;/b&gt; 
 extension point) to viewers (defined through the 
-&lt;b&gt;org.eclipse.ui.views&lt;/b&gt; extension point). Any content 
-extension bound to a viewer is described as &lt;i&gt;visible&lt;/i&gt;. A
+&lt;b&gt;org.eclipse.ui.views&lt;/b&gt; extension point). &lt;b&gt;viewerContentBinding&lt;/b&gt; also binds a 
+&lt;b&gt;linkHelper&lt;/b&gt; extension point to a viewer.  
+Any content extension bound to a viewer is described as &lt;i&gt;visible&lt;/i&gt;. A
 content service (&lt;code&gt;org.eclipse.ui.navigator.INavigatorContentService&lt;/code&gt;)
 will not return any extensions which are not visible for
 its viewer id.
@@ -92,7 +93,7 @@
    <element name="viewerContentBinding">
       <annotation>
          <documentation>
-            Clients must define one or more &lt;b&gt;viwerContentBinding&lt;/b&gt; elements to describe which content extensions and common filters are &lt;i&gt;visible&lt;/i&gt; to the viewer. A content extension or common filter is &lt;i&gt;visible&lt;/i&gt; if the id of the content extension or common filter matches an &lt;b&gt;includes&lt;/b&gt; statement under a &lt;b&gt;viewerContentBinding&lt;/b&gt; and is not excluded by an &lt;b&gt;excludes&lt;/b&gt; statement. If a content extension or common filter is not &lt;i&gt;visible&lt;/i&gt; to a viewer, then the extension will never be asked for content by a content service for that viewer or be presented to the user in the available filters dialog. 
+            Clients must define one or more &lt;b&gt;viewerContentBinding&lt;/b&gt; elements to describe which content extensions, common filters, and link helpers are &lt;i&gt;visible&lt;/i&gt; to the viewer. A content extension or common filter is &lt;i&gt;visible&lt;/i&gt; if the id of the content extension or common filter matches an &lt;b&gt;includes&lt;/b&gt; statement under a &lt;b&gt;viewerContentBinding&lt;/b&gt; and is not excluded by an &lt;b&gt;excludes&lt;/b&gt; statement. If a content extension or common filter is not &lt;i&gt;visible&lt;/i&gt; to a viewer, then the extension will never be asked for content by a content service for that viewer or be presented to the user in the available filters dialog. 
 &lt;br&gt;&lt;br&gt;
 Clients may define an &lt;b&gt;includes&lt;/b&gt; element to select which extensions are &lt;i&gt;visible&lt;/i&gt; to the viewer, and similarly an &lt;b&gt;excludes&lt;/b&gt; element for extensions that should not be made &lt;i&gt;visible&lt;/i&gt; to the viewer. Clients may further define the extensions that should be explicitly queried for root elements (through  ITreeContentProvider.getElements()) by the &quot;isRoot&quot; attribute. If one or more &lt;b&gt;contentExtension&lt;/b&gt; elements have &quot;isRoot&quot; set to true within the &lt;b&gt;includes&lt;/b&gt; statement, only those extensions will be queried for root elements. The &quot;isRoot&quot; attribute has no effect for exclusions.
 &lt;br&gt;&lt;br&gt;
@@ -601,7 +602,7 @@
          <meta.section type="implementation"/>
       </appInfo>
       <documentation>
-         
+
       </documentation>
    </annotation>
 
@@ -610,7 +611,7 @@
          <meta.section type="copyright"/>
       </appInfo>
       <documentation>
-         Copyright (c) 2002, 2006, 2008 IBM Corporation and others.&lt;br&gt;
+         Copyright (c) 2002, 2008 IBM Corporation and others.&lt;br&gt;
 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 &lt;a