XML / XSL > HTML

I'm wondering whether anyone can help me out with this. ASP has a nice function which parses two files - XML and XSL and outputs pure HTML to the browser. I've looked through the documentation I could find for PHP XML functionality and could only find explanations for making custom parsers. What I'm looking for is something like what ASP offers - this simple way of parsing the two files server side to send pure HTML to the client. I can't beleive this doesn't exist because PHP does pretty much everything else that ASP does, but I can't see how its done. Any help would be greatly appreciated.