[no subject]

Sunil Kunisetty <sunil.kunisetty@oracle.com> wrote at Fri, 20 Feb 2004 17:49:54 -0800:
> Tony Graham wrote:
...
> > What about the singleton case that also has a sequence number?
> 
>  In our colloquial references, a singleton is a message without SeqNum.
>  If it has a SeqNum, then it is considered has a Group. A group of
>  1 is still valid.... In such case, the following example will apply

If you mean considering a Group with only one message (that uses
SequenceNum) as a Group for the purposes of reporting an
Acknowledgment or Fault for that Group, then I see what you mean.

However, Section 2.3 says, beginning at line 512, that a singleton
group can be a message with a SequenceNumber:

   (1) In case there is only one message in the group (singleton): the
       group ID, which is a globally unique group identifier, may be
       used alone as Message Identifier. No sequence number is
       required, although allowed.

I asked on Monday [1] what a singleton group with a sequence number
would look like. (Well, I really just said that the spec should provide
an example.)

A group of 1 is not valid since the 'status' attribute can't indicate
both the start and end of a group, and the 'status' value has to be
'Start' for the first message in a group (line 989):

   The sender node MUST send a very first message, to guarantee the
   message order, with "Start" for this attribute.

...
>  Currently there is no way to distinguish a Group with only one message
>  (that uses SequenceNum)  as a Singleton unless Request Header is
>  also changed to reflect something similar.

Then Section 2.3 should be changed or the 'status' attribute should
allow a 'Single' value (or similar).  At this point I think that it
would be simpler to change Section 2.3.

Regards,


Tony Graham
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[1] http://www.oasis-open.org/archives/wsrm/200402/msg00127.html