FLAC format: "autonomous" documentation

Hello,

I read through the specifications here:
http://flac.sourceforge.net/format.html
but the document is not "autonomous".

Instead, sections entitled "prediction" and "residual coding",
use external references, some of with are unavailable
(dead link) or in poor state.

What i mean here is that it is not possible to
write a decoder from scratch using only the spec document:
it's OK fo metadata, but apparently does not tell
everything about the audio data format.

To make sure everyone will be able to decode
FLAC data in decades from now, it would be nice
to have a single, self-contained document
about audio data in FLAC files !

Paul