a Normative References topic

http://lists.w3.org/Archives/Member/w3c-svg-wg/2004OctDec/0419.html 
(member-only)

This is an interesting aspect of the (open) normative references topic for 
SpecGL.  A normative reference might not be tied to a specific version of 
the referenced standard.  This means that the conformance requirements for 
the referencing standard might change over time.

-Lofton.