examples/org.eclipse.gmf.sketch.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/gmf/2007/sketch" 
       class = "org.eclipse.gmf.sketch.provider.SketchItemProviderAdapterFactory" 
       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>