code: public DataSourceType<WebFragmentType<T>> getOrCreateDataSource()
     {
        List<Node> nodeList = childNode.get("data-source");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new DataSourceTypeImpl<WebFragmentType<T>>(this, "data-source", childNode, nodeList.get(0));
        }
        return createDataSource();
     }
docs: If not already created, a new <code>data-source</code> element will be created and returned.
  Otherwise, the first existing <code>data-source</code> element will be returned.
  @return the instance defined for the element <code>data-source</code>