code: public FacesConfigRedirectViewParamType<FacesConfigRedirectType<T>> getOrCreateViewParam()
     {
        List<Node> nodeList = childNode.get("view-param");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new FacesConfigRedirectViewParamTypeImpl<FacesConfigRedirectType<T>>(this, "view-param", childNode, nodeList.get(0));
        }
        return createViewParam();
     }
docs: If not already created, a new <code>view-param</code> element will be created and returned.
  Otherwise, the first existing <code>view-param</code> element will be returned.
  @return the instance defined for the element <code>view-param</code>