Discussants might find some interest in a survey of NXM's semantics that
I did some time ago (H. Van Dyke Parunak, "A Semantic Survey of NHM:'
Bib 56 (1975) 512-32). I'm nervous about posting copyright material
without a release, and Biblica's on-line archives don't go back quite
that far, but I'd be happy to send a scanned copy upon request.
Van Parunak