MUST/SHOULD and related terminology

[Martin Duerst <duerst at w3.org>]

Dear IETFers,

This is a question that I hope some of you can help me with.

The IETF uses the terms MUST/SHOULD/MAY very consistently,
according to http://www.ietf.org/rfc/rfc2026.txt.

I seem to remember that there is also some terminology
for implementations, in particular some terms for
1) implementations that do all the MUSTs, but not necessarily more
2) implementations that do all the MUSTs and all the SHOULDs

Can somebody point me to this terminology? Thanks in advance,    Martin.

#-#-#  Martin J. Du"rst, I18N Activity Lead, World Wide Web Consortium
#-#-#  mailto:duerst at w3.org   http://www.w3.org/People/D%C3%BCrst