p2updatesite/category.xml

<?xml version="1.0" encoding="UTF-8"?>
<site>
   <feature id="org.eclipse.emf.henshin.sdk">
      <category name="org.eclipse.modeling"/>
   </feature>
   <feature id="org.eclipse.emf.henshin.sdk.source">
      <category name="org.eclipse.modeling"/>
   </feature>
   <category-def name="org.eclipse.modeling" label="Modeling">
   </category-def>
</site>