In the early 2000s XML was the cool shiny thing. They're still using it, in fact I found out recently that someone wrote a Markdown to 'doctype grahame' converter to 'modernise' the site.
I guess what I actually built back then was an early static site generator, but it's still kind of cool they're using it 19 years later, hacky as it was / is :)
I regret nothing. Editing simple xml using Emacs is a breeze.