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Subject: RE: Does the current CPA/CPP spec support multi-hop?


Philippe, David,

I try to summarise what I understood of them and provide some generic
comment here.

- if B is NOT ebXML aware and cannot enter in a CPA with A, I do not
  understand how this may be a multi-hop scenario.

- if the Hub needs to "convert" the message from HTTP to SMTP (or any other
  conversion stuff) then either this conversion is mechanical or it is
  another way for defining an active participation of the HUB into the
  Business Process.

- In my modest opinion, multi hop is when the Hub really does not do
anything
  else than acting as a middle point, without translation nor change in
  the protocol semantic. In my opinion what you both describe is a situation
  where the Hub does much more than that: at least it implements a
rudimental
  state machine to twist things from the sender to the receiver.

- I think (but this is simply me) that whenever the segments should change
  protocol semantic, then we do not actually think of a hub but think to
  a Party (which may not be very intelligent, but is anyway accountable of
the
  minimum work that it does)

This last thing is what makes me thinking my way; whenever there is some
action
(translation, change of protocol) we have a new actor in the chain which
may become accountable of any fault.
I remember that in Tokyo I tried to define the difference between a hub and
a party
on respect to accountability: a hub is just a technical mean which will
never
become accountable because it is not actually seen by the participants.

Sorry if these are just brainstomring thoughts. Hope they make at least some
sense.

Best regards

/Stefano


/stefano

 -----Original Message-----
 From: Philippe DeSmedt [mailto:PDeSmedt@viquity.com]
 Sent: 31 January 2001 20:37
 To: 'Burdett, David'; 'Stefano POGLIANI'; Martin W Sachs;
 ebxml-tp@lists.ebxml.org
 Subject: RE: Does the current CPA/CPP spec support multi-hop?


 David,

 I like your suggestion to have, in the case of multi-hop messaging, a
 separate CPA covering the transport aspects on each of the hops. The
 business agreement between A and B can still be encoded in a CPA between
 those two parties, but we do indeed need provisions (possibly as some form
 of CPA) that address the specifics of the transport on each of
 the hops. It may, for instance, be possible to have different transport
 bindings on each hop (e.g. HTTP between A and the hub, and SMTP between B
and the
 hub), and I am not sure that such case is adequately covered in the
current CPA spec.
 Also, as you mention in your ebXML-to-EDI example, there may not be an
 ebXML-compliant CPA between A and B, but we may still want to have one
 between A and the hub (assuming that A speaks ebXML).

 In addition, there may also be cases where the role of the hub is more
than
 just a forwarding mechanism, but less than that of a full-fledged trading
 partner, i.e., the hub may provide some value-added services, for instance
 in the area of security. How CPAs can address that modality/topology is
yet
 an entirely different issue that I do not believe we have covered in CPA
so
 far.

 The bottomline is that we need to differentiate between CPA information
that
 covers the business aspects of the interactions between two partners, and
 the information that is required to carry the message over possibly
multiple
 hops. In addition, we may want to take a closer look at what functionality
 is actually provided at the intermediate points.

 -Philippe
 _______________________________
 Philippe De Smedt
 Architect
 Viquity Corporation (www.viquity.com)
 1161 N. Fair Oaks Avenue
 Sunnyvale, CA 94089-2102
 (408) 548-9722
 (408) 747-5586 (fax)
 pdesmedt@viquity.com


 -----Original Message-----
 From: Burdett, David [mailto:david.burdett@commerceone.com]
 Sent: Wednesday, January 31, 2001 10:51 AM
 To: 'Stefano POGLIANI'; Martin W Sachs; ebxml-tp@lists.ebxml.org
 Subject: RE: Does the current CPA/CPP spec support multi-hop?


 Stefano

 Although you can think of it as one business process with three parties, I
 don't think this is the best way of looking at it as:
 1. It would require that for every new business process between A and B,
 then the Hub woould have to be involved whereas all that is required is
for
 the Hub to forward the new message.
 2. One of the parties, e.g. Party B, may not be ebXML aware as they are
 using EDI and therefore cannot sensibly enter into a CPA with Party A.

 The better way to think of it,IMO, is as a two CPAs between A and the Hub,
 and B and the Hub which are only concerned with the transport of messages
 and not the business process.

 Thoughts?

 David





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