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You seem to be off by a factor of 10. YAML spec pdf is only 80 pages.

When I print preview XML 1.0 [1], it says '41 pages', so it's about half of YAML. (And this includes DTD.)

but it doesn't include namespaces

Namespaces [1] will add 13 more pages. It's a tiny extension.

OK I was way off, the sheer complexity definitely feels like 700 pages though ;)