i001 and Proposal

["Lei Jin" <ljin@bea.com>]

I'm restating issue 001 to provide more details.

Title: Bilateral sequence negotiation

Description: The current draft of the WS-ReliableMessaging specification
defines the wsrm:Offer element as follows: "This element, if present,
enables an RM source to offer a corresponding Sequence for the reliable
exchange of messages transmitted from RM destination to RM source".  As
per the text above, the spec does not constrain what messages an offered
sequence can be used to send, nor does it define when an offer element
must or must not be present.  

However, WSRX-ReliableMessagingPolicy document, lines 221-226, states
that an offer element must be present if and only if the endpoint
declares output messages.

"Per WS-ReliableMessaging [WS-RM], a wsrm:CreateSequence request MAY
contain an offer to create an "inbound" Sequence. If the RM policy
assertion is attached to an endpoint declaring only input messages, the
endpoint MUST reject a wsrm:CreateSequence request containing a
wsrm:Offer to create a corresponding Sequence. If the assertion is
attached to an endpoint declaring both input and output messages, the
endpoint MUST reject a wsrm:CreateSequence request that does not contain
a wsrm:Offer to create a corresponding Sequence."

IMO, an offer is an optimization to allow a reverse reliable sequence to
be set up without going through the whole CreateSequence handshake.
Thus, this limitation in the policy documents seems to be unnecessary.

Justification: There are cases when I need to send reliable messages to
an endpoint, but I don't require responses to be sent back reliably.
(see i021)  In that case, requiring an offer is unnecessary.  There are
also cases when the destination endpoint doesn't declare output
messages, but needs to send messages reliably to the source endpoint in
other types of MEP (eg: oneway, callback MEP).  In that case, having an
offer is a useful optimization.

Related Issues: i021

Origin: Lei Jin

Owner: Lei Jin

Proposal:

Delete lines 221-226 of WSRX-ReliableMessagingPolicy document.