[MMUSIC] SDPCapNeg Issue #1: To Add, Delete and Replace Attributes

Probably the biggest open issue we have in the SDP Capability 
Negotiation Framework at this point is the ability to replace and delete 
attributes from an actual configuration SDP when generating a potential 
configuration. At the Prague IETF, people asked for some more 
motiviation and use cases for this feature before deciding whether we 
should include it in the core capability negotiation framework or not. I 
have written a short I-D in the subject, which you can find at:

http://www.ietf.org/internet-drafts/draft-andreasen-mmusic-sdpcapneg-att-del-00.txt

Please take a look at this and let me know how you think we should 
resolve this issue. Options include:

A) Remove the ability to delete and replace attributes completely.
B) Remove the ability to delete and replace individual attributes, but 
allow for complete removal of all attributes (clean slate)
C) Keep the current ability to delete and remove individual and all 
attributes.

My personal preference is for option A, however in the interest of 
moving forward and making a reasonable compromise between functionality 
and complexity, my recommendation is option B.

Thanks

-- Flemming

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