I've been a fan of XML tech for ~years~ decades (dang). But, let's be honest, most of this stuff should've been thought-technology, not a fixed implementation.

I've been a fan of XML tech for ~years~ decades (dang). But, let's be honest, most of this stuff should've been thought-technology, not a fixed implementation. Like, I have a decorator based Python library that passes values by-copy, enforcing a sort of local immutability, and also offering all of the pattern-matching capabilities of XSL, but in Python. I can extend the pattern matching with arbitrary Python functions.