Rather, think of it as the grandfather of all filtering and transformation constructs.
相反，将它当成是所有过滤和转换结构的来源。
2
Those subclasses work together to handle authentication, filtering, security, data transformation, and routing the incoming requests to the respective resources.
这些子类能够一起处理验证、过滤、安全、数据转换以及将传入请求路由到相应资源等操作。
3
Another use case is dynamic retrieval and enforcement of the policies that are in effect for a service interaction in the areas of logging, filtering, data transformation, or routing.