It feels strange to reply to myself, but I like to make the progress clear to all on the list, so here it goes :)
As agreed on the last OGF, Jeroen and I have worked on the definitions of Adaptation, Adaptation Function and Adaptation Services.
The discussion has faded. The two comments were: - The word "collection" in the Layer definition is not clear. (It seems to imply that *all* ports in a Layer need to be listed in order to define a layer). - The current definitions do not cover multiplexing and sublayers. - The current definitions do not cover channels and named links. I propose that the authors (Jeroen and me) improve the first two items. However, channels and links seem distinct issues, for which the NSI group may have some requirements. I will shortly call for volunteers who like to propose definitions on the issue of links and paths. Regards, Freek