Visiting and transforming trees is indeed a well trodden pattern. Here’s another kind of tree walking which I’ve enjoyed working with, this year: https://libc

Visiting and transforming trees is indeed a well trodden pattern. Here’s another kind of tree walking which I’ve enjoyed working with, this year: https://libcst.readthedocs.io/en/latest/tutorial.html#Build-Visitor-or-Transformer https://libcst.readthedocs.io/en/latest/tutorial.html#Build-... It is a little less pure than the functional XSLT, and also a lot more practical.