NVidia published an article about using SAS with FX Composer.
I did like the old (1.x) FX Composer, and I was really disappointed by the new one, but at least now I can know how to use SAS annotations and scripting. I wasn't ever able to found anything on them on internet (they are/were Microsoft standard annotations but there's nothing useful on them on the directx sdk documentation).
Strange thing that they wrote this now, wasn't Collada FX supposed to be used instead of SAS in the new FX Composer?
Note: non-semantic stuff is well documented in the DirectX SDK http://msdn.microsoft.com/en-us/library/bb173005(VS.85).aspx