Support Negotiations

Eric posted this request for TAXII on the STIX list...
#BEGIN
I would also strongly suggest that we adopt (in TAXII) a negotiation mechanism. For examples, see HTTP (the accept and   require headers), SMTP (the server listing out everything optional it supports and leaving it up to the client to pick from the list), and SIP (offer / answer, where the client offers capabilities, the server picks what it supports from the list, and the client agrees (or not)). If we have a negotiation mechanism, then people’s code gets a lot less complicated. You know up front what you will and will not do. Anything outside the boundaries then gets gracefully handled.
#END
Thanks,
Bret
Bret Jordan CISSP
Director of Security Architecture and Standards
Office of the CTO  Blue Coat Systems
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