Flintstones/bundles/flintstones.application.perspective.framework.ui/plugin.xml

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

   <extension
         id="flintstones.framework.ui.fragment"
         point="org.eclipse.e4.workbench.model">
      <fragment
            uri="fragment.e4xmi">
      </fragment>
   </extension>

</plugin>