XSLT is somewhat explicitly a programming environment: that's how people use it, and the extent to which the syntax for it was awkward in XSLT 1 it was all made almost reasonable in XSLT 2. Like, even in XSLT 1, the only mental gymnastic you have to do is say "function" every time you see "template": the language already has "parameters" and a "call" primitive, so it is a straightforward functional language. What makes this list interesting is that these things have to be twisted in weird ways to become programming environments. Putting XSLT on the list is more like putting brainfuck on the list: its irritating the program in, but it isn't surprising that it's turing complete.
