yakindu/plugins/org.yakindu.base.expressions/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>
<plugin>
  <extension point="org.eclipse.emf.ecore.generated_package">
    <package 
       uri = "http://www.yakindu.org/base/expressions/Expressions" 
       class = "org.yakindu.base.expressions.expressions.ExpressionsPackage"
       genModel = "model/Expressions.genmodel" /> 
  </extension>
</plugin>