tests/org.eclipse.xtend.tests/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>

<plugin>

  <extension
         point="org.eclipse.xtend.typesystem.emf.checks">
      <metaModel
            nsURI="http://www.itemis.de/emf.oaw.check.test"
            override="true">
         <checkFile
               path="org/eclipse/xtend/typesystem/emf/check/model/check.chk">
               <referencedMetaModel nsURI="http://oaw.org/test/subpackage">
               </referencedMetaModel>
         </checkFile>
      </metaModel>
   </extension>
   
  <extension point="org.eclipse.emf.ecore.generated_package">
    <package 
       uri = "http://www.itemis.de/emf.oaw.check.test" 
       class = "org.eclipse.xtend.typesystem.emf.check.model.test.TestPackage"
       genModel = "src/org/eclipse/xtend/typesystem/emf/check/model/test.genmodel" /> 
  </extension>

  <extension point="org.eclipse.emf.ecore.generated_package">
    <package 
       uri = "http://oaw.org/test/subpackage" 
       class = "org.eclipse.xtend.typesystem.emf.check.model.test.subpackage.SubpackagePackage"
       genModel = "src/org/eclipse/xtend/typesystem/emf/check/model/test.genmodel" /> 
  </extension>

</plugin>