Point of procedure, concerning the rules of citing outside specifications:
(Remembering that 'procedures' are still new things and subject to change)
Specs may cite other specs. Documentation of the outside specs must be
'freely' available, through reasonably formal methods. If a document is
not already "published" then it might be published as an Informational
RFC, just to make accessing it more reliable. If the spec is part of someone
else's standards process...
then the Internet spec may not go to the final Standard level prior to the
external spec's reaching ITS final standard level. The Internet spec,
however, MAY go to Proposed and then Draft, prior to having to external
spec reach its final resting status.