how we use form validation in struts using validate.xml

i am using struts for design frontend. but now i want to validate field using validate.xml. so if any person have some idea. then give me just small example. because from net example this is not clear.

This article from OnJava has a complete example using the Struts Validation Framwork along with a good explanation. For more of a reference type document, see The Struts Validator Guide. Once you've read these sources, let us know if you still have questions.
[ March 24, 2008: Message edited by: Merrill Higginson ]