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1. What does "nearly identical" mean? A later sentence (starting with "Typically") seems to indicate that the difference between two "nearly identical" messages could be more than just "their destinations".
http://www.w3.org/2007/03/07-xmlprotocol-minutes.html ACTION: Dave to provide text to address wsdl #1 [recorded in http://www.w3.org/2007/03/07-xmlprotocol-minutes.html#action04]
RESOLUTION: WSDL #1 closed with the following revised text for para 1 sect 2.2: The scope of a one-way MEP instance is limited to transmission of messages from one sending node to zero or more receiving SOAP node(s). The ImmediateSender and ImmediateDestination properties may differ among nodes. The envelope in the InboundMessage property at each successful receiver SHOULD be identical to the envelop in the OutboundMessage at the sender. See http://www.w3.org/2007/03/21-xmlprotocol-irc#T19-28-57