code: public TldExtensionType<WebJsptaglibraryDescriptor> getOrCreateTaglibExtension()
     {
        List<Node> nodeList = model.get("taglib-extension");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new TldExtensionTypeImpl<WebJsptaglibraryDescriptor>(this, "taglib-extension", model, nodeList.get(0));
        }
        return createTaglibExtension();
     }
docs: If not already created, a new <code>taglib-extension</code> element will be created and returned.
  Otherwise, the first existing <code>taglib-extension</code> element will be returned.
  @return the instance defined for the element <code>taglib-extension</code>