Generally, I think the spec is well rounded and has the right scope for a 1.0 version of this subject.

Some small comments:

pg6, para 2 "record the protocols that can be used". I didn't understand this well first time reading it (the usage of 
the word 'record').  Do you mean "query for the protocols", "negotiate the protocols", 


pp12, 4.1.2.1 Typo dmi:UndoStratergy -> dmi:UndoStrategy