plugins/org.eclipse.jem.workbench/plugin.xml

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

     <extension
         id="JavaEMFNature"
         name="%JavaEMFNatureName"
         point="org.eclipse.core.resources.natures">
      <runtime>
         <run
               class="org.eclipse.jem.internal.plugin.JavaEMFNature">
         </run>
      </runtime>
   </extension>
   
   <extension
         point="org.eclipse.jem.util.nature_registration">
      <nature
            id="org.eclipse.jem.workbench.JavaEMFNature">
      </nature>
   </extension>   

</plugin>