plugins/org.eclipse.emf.ecore.xcore.edit/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>
<plugin>

   <extension point="org.eclipse.emf.edit.itemProviderAdapterFactories">
      <factory
            uri="http://www.eclipse.org/emf/2011/Xcore"
            class="org.eclipse.emf.ecore.xcore.provider.XcoreItemProviderAdapterFactory"
            supportedTypes=
              "org.eclipse.emf.edit.provider.IEditingDomainItemProvider
               org.eclipse.emf.edit.provider.IStructuredItemContentProvider
               org.eclipse.emf.edit.provider.ITreeItemContentProvider
               org.eclipse.emf.edit.provider.IItemLabelProvider
               org.eclipse.emf.edit.provider.IItemPropertySource"/>
   </extension>

</plugin>