XSLT 2.0

What features of 2.0 do you (think you) need? In my own experience 1.0 is often enough.

No outside software

If you're looking for a pure Perl implementation for XSLT 2.0 you can forget about it. Most solutions are Perl wrappers of existing tools, e.g. of LibXSLT. I think support for XSLT 1.0 is as good as it gets. If you weaken the "no outside software" a bit you could use the home edition of Saxon which is open source and supports most of the features.

Cheers

Harry