You may or may not know of a famous post declaring the death of FreeBSD, which was abstracted to cover several other technologies. [If not, google for "netcraft

You may or may not know of a famous post declaring the death of FreeBSD, which was abstracted to cover several other technologies. [If not, google for "netcraft confirms it".] I personally would not bother. I played with XSLT and its predecessor called DSSSL or something like that, back in the late 90's. It hasn't taken over the world yet, and I don't expect it to surprise us. There are many other ways to manipulate a DOM, eg Javascript, that are much more sophisticated and widely supported. If you want to get a particular job that requires deep expertise in XSLT, well, that's your decision. But I would not peg it as a generally-useful skill.