XSLT newbie looking for an easy to use processor (java

I'm new to this list so first off: Hi everybody :-)
As the topic already states I'm looking for an easy to use XSLT processor (in Java), it doesn't have to be very smart or anything, here's a brief description of what I want to use it for:
I want to pass an XML string and a corresponding XSLT description to it, which is used to sort of parse the XML string. The XML string will contain a number of items/elements (like name, phone and so on) and there are a number of XSLT descriptions, one for each parameter, to sort of crop the string so it will only contain the needed parameter. So all I need is a XSLT processor which is easy to use, accepts an XML string for input and returns another string as a result.
(Additionally :
In case the result of an XSL transformation should contain more than just one item it should be possible to define a delimiter for the result string so I can distinguish the items (I can't think of an appropriate example ... let's say there are two items called "Name" in the XML string ;P)

As I mentioned in the headline I really don't know much about XSLT (I'm working on it though) so I hope you can help me out on this :) 

regards

Chriss