Thank you very much. I already downloaded jaxp-1_0_1 and jaxp_tutorial-2_5, and test some examples.It is amazing ! That should be the realy n tier system which is based on XML.
Especially, XML can display vary client view in web site according to different rule.
BTW, your tag is very interesting ! You know everything from Z to A !
I am glad to meet you on internet.

Thaks.