examples/workspace/org.eclipse.egf.example.type.extension.egf/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>

   <extension
         point="org.eclipse.egf.core.fcore">
      <fcore
            id="egf/extension.fcore">
      </fcore>
   </extension>

</plugin>