bundles/org.eclipse.emf.ecp.view.model.preview.common/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension
         point="org.eclipse.core.expressions.definitions">
      <definition
            id="org.eclipse.emf.ecp.view.model.preview.common.definition1">
         <with
               variable="selection">
            <iterate>
               <instanceof
                     value="org.eclipse.emf.ecp.view.spi.model.VView">
               </instanceof>
            </iterate>
         </with>
      </definition>
   </extension>

</plugin>