code: public MethodParamsType<QueryMethodType<T>> getOrCreateMethodParams()
     {
        Node node = childNode.getOrCreate("method-params");
        MethodParamsType<QueryMethodType<T>> methodParams = new MethodParamsTypeImpl<QueryMethodType<T>>(this, "method-params", childNode, node);
        return methodParams;
     }
docs: If not already created, a new <code>method-params</code> element with the given value will be created.
  Otherwise, the existing <code>method-params</code> element will be returned.
  @return  a new or existing instance of <code>MethodParamsType<QueryMethodType<T>></code>