NEW ISSUE: correct form of SeqAck when RMD has received no messages

[Christopher B Ferris <chrisfer@us.ibm.com>]

Title: What is the correct form of SeqAck when RMD has received no 
messages

Description: Consider the following scenario: an RMS establishes a 
Sequence with 
CreateSequence and transmits a single message that is NOT received by the 
RMD. It then follows
that with an AckRequested message. What is the correct form of the 
SequenceAcknowledgement
expected? Should one be sent?

Justification: The specification and schema require that a 
SequenceAcknowledgement element
have at least one AcknowledgementRange child element (or a Nack) Yet, 
MessageNumber values
start at 1 and increment monotonically by 1 for each successive message in 
a Sequence. Zero (0)
is not a valid MessageNumber. 

Target: core

Type: design

Proposal: Recommend that an RMD be required to respond with a 
SequenceAcknowledgement
element containing exactly one AcknowledgementRange child element that has 
both the
@Upper and @Lower attributes each carry a value of "0" to signify that no 
messages have been
received for a given Sequence. e.g.

<wsrm:SequenceAcknowledgement 
xmlns:wsrm="http://docs.oasis-open.org/whatever";>
  <wsrm:Identifier>http://example.org/mysequence/1234</wsrm:Identifier>
  <wsrm:AcknowledgementRange Upper="0" Lower="0">
</wsrm:SequenceAcknowledgement>

Related issues: none
Cheers,
Christopher Ferris
STSM, Emerging e-business Industry Architecture
email: chrisfer@us.ibm.com
blog: http://webpages.charter.net/chrisfer/blog.html
phone: +1 508 377 9295