plugins/org.eclipse.app4mc.amalthea.visualization.hw/plugin.xml

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

   <extension
         id="org.eclipse.app4mc.amalthea.visualization.hw.fragment"
         point="org.eclipse.e4.workbench.model">
      <fragment
            uri="fragment.e4xmi"
            apply="always">
      </fragment>
   </extension>
   <extension
         point="org.eclipse.core.expressions.definitions">
      <definition
            id="org.eclipse.app4mc.amalthea.visualization.hw.expression">
               <with
                     variable="activeMenuSelection">
                  <iterate
                        ifEmpty="false">
                     <instanceof
                           value="org.eclipse.app4mc.amalthea.model.HWModel">
                     </instanceof>
                  </iterate>
               </with>
      </definition>
   </extension>

</plugin>