However, while I use JSON and YAML for many tasks, I still find XML (and
related technologies such as DocBook 5, XPath, RELAX NG, and XSLT ) of use.
I was bit curious, when I read your above posted lines. You didn't mention XML Schema (i.e, W3C XML Schema) in that list. I guess, XML Schema is widely used. Perhaps you don't use XML Schema much, or was it for any other reason? I mean, W3C XML Schema in this paragraph.
Btw, I think RELAX NG is an important XML Schema language :)
