Comment on draft-creed-ogc-urn

I can't review 
https://portal.opengeospatial.org/wiki/twiki/bin/view/Member/OGCUrnIntro ? I am
happy to clear this discuss if we feel that it is fine to approve this without
reviewing the assignment procedures as long as we agree that we will
consistently apply that decision to future URN registrations as well as this
one.