As I don't remember who is especially interested in this kind of music, I'll give this information to anyone woh is interested. After all, it's been discussed more than once in this forum :)
on the Thesaurus Musicarum Latinarum (http://www.music.indiana.edu/tml/tofc1.html), there is a page that describes briefly the names of noteshapes, and the code used to notate it (as text!!) in TML text.
Not very useful for NWC itself, but may be of interest for some users though.
But I'll keep on using NWC, even for old gregorian chant!
NWCly yours