Xml/xpath/xslt

Hi,
	I am currently working on a xml file.  What I want to do about it is to = build a query library which can accept some query (like the tag name) = and then return the value of that tag.  I hope I can use the same = function in the query library to get the same result even though the xml = file changes (but not dramatically).  I don=92t know if Xpath or XSLT = will help me on that because I want to build the query library in Java = and Xpath & XSLT seems mainly working for web pages.  If anyone has = experiences on this or knows any product will do this I would appreciate = that very much.  Thanks a lot.

Regards,

~Adam