plugins/org.eclipse.xsd.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/xsd/2002/XSD" class="org.eclipse.xsd.provider.XSDItemProviderAdapterFactory" 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>