Negotiation Flow

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Message  Meaning  U to S?  S to U?  After Receiving  Expected Response  Data in Message  Optional in Message 
OK Proposal acceptable or data transfer successful Yes Yes PROP or TXD none MD5 hash of agreement or data transferred  
PROP Here's a Proposal Yes Yes any time OK, SRY, or PROP Text of a proposal Signature of initiator, fingerprint of previous Proposal
SRY Sorry - request not processed Yes Yes PROP, TXD PROP or none Reason code and {MD5 hash of proposal, or MD5 hash of data} Which practices are unacceptable (To Be Designed)
TXD Transfer Data Yes Yes any time none, OK or SRY Data element names and values to be written, as requested Agreement

Joseph Reagle

W3C