Input validation is declarative, meaning you simply tell Tapestry what validations to apply to a given field, and it takes care of it on the server and (once implemented) on the client as well.

• 这是更有效的从用户处收集有用信息的方法。不管它是一个搜索表单、一个登录窗口或是一个多页的注册向导，用户使用表单真正向应用表达自己。