code: public ModuleType<ApplicationDescriptor> getOrCreateModule()
     {
        List<Node> nodeList = model.get("module");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new ModuleTypeImpl<ApplicationDescriptor>(this, "module", model, nodeList.get(0));
        }
        return createModule();
     }
docs: If not already created, a new <code>module</code> element will be created and returned.
  Otherwise, the first existing <code>module</code> element will be returned.
  @return the instance defined for the element <code>module</code>