uriMappings for installed plugins

plugins/org.yakindu.sct.model.stext/plugin.xml

@@ -15,4 +15,13 @@
             location="libraries/Primitives.types">
       </TypeLibrary>
    </extension>
+   <extension
+         point="org.eclipse.emf.ecore.uri_mapping">
+      <mapping
+            source="platform:/resource/org.yakindu.sct.model.stext/model/"
+            target="model/">
+      </mapping>
+
+   </extension>
+   
 </plugin>