what the fuck is so good about SGML

hurr le XML is le bad but le SGML is awesome!!!!!!!11!!

What's sooooo good about it?

Take a good idea out of its infancy, let it age without
guidance so it does not mature, and it generally goes bad. If GML
was an infant, SGML is the bright youngster far exceeds expectations
and made its parents too proud, but XML is the drug-addicted gang
member who had committed his first murder before he had sex, which
was rape.

Naggum said this. What does he like so much about SGML? The original thread was about s-exps vs XML too, no idea why he's saying that.