Why throw out numbers when we all know you haven't actually measured that it's >80%?

In any case, the tooling around XML (DTDs, XPath, XSLT, etc.) is the reason to use it. I would go so far as to say the (supposed) >80% not using those features shouldn't have used XML in the first place.

I agree.. which is part of why I generally dislike using XML for most things.