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

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension
         point="org.eclipse.emf.ecore.dynamic_package">
      <resource
            location="model/XcoreLang.xcore"
            uri="xcore.lang">
      </resource>
   </extension>
</plugin>