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Subject: Assumptions of the Transport Protocol Layer

At the last WSRM TC meeting we initiated discussion on the assumptions 
the requirements should make on the Transport Protocol capabilities.

It was stated that the Co-sponsors assumed TCP under HTTP.

There were some statements that TCP connections give flow control, and 
sequencing capabilties already.

However, we need to address reliability at the app to app level.

Even if the http layer implements use of Persistent TCP connections, 
the sending app does not know if the receiving app received the message 
successfuly, when the TCP layer signals a connection failure.

Another concern is that the WS-RM sender may use more than one TCP 
connection for its  outgoing message sequences.   Thus, when sequences 
of sent messages span multiple transport connections, the messages can 
arrive out of sequence, or succeeding on one message while failing on a 
subsequent message.

Tom Rutt		email: tom@coastin.com; trutt@fsw.fujitsu.com
Tel: +1 732 801 5744          Fax: +1 732 774 5133

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