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Subject: RE: [ebxml-msg] RE: The Return Path Problem
Dan I agree with your definition of a "Party", and yes I assume that there is only one MSH within a party that implements a Service and Action. I also agree that we need to be more explicit about what is (or is not) a Party and MSH. However I don't think that limiting a Party to one MSH Service and Action is necessarily a problem as: 1. A Party can represent a division of a company (as in DUNS+4) 2. If you need more than one MSH for a Service and Action within a company, then you do content based routing where some other data (perhaps in the payload) is ued to do the second level routing. I also think that a CPA should be between businesses and not between applications as the maintenance level required by the keeping CPAs between individual applications is too high. What I think Marty's suggestion implies would mean you would have to update your CPA with a business if you wanted to do a query for a new reason. I also agree that Service and Action are "what" type information and that we need the "how". It's just that I think you should be able to dervice the "how" dynamically from the "what" rather than just ignore the "what" for routing purposes. Regards David -----Original Message----- From: Dan Weinreb [mailto:dlw@exceloncorp.com] Sent: Monday, November 12, 2001 1:41 PM To: david.burdett@commerceone.com Cc: ebxml-msg@lists.oasis-open.org Subject: Re: [ebxml-msg] RE: The Return Path Problem In my mind, the topic of your paper is closely related to the questions I've been asking about "how do you name an MSH" or "how do you name a party". I think there has been some confusion about what we mean by a "party": is "ABC Co" is a party, or is "Order Management MSH" a party? Marty seemed to be suggesting the latter, to which I replied that then a "partyId" would not be an identifier of a "party". It looks to me like you're assuming: -- ABC Co. is one "party". Order Management MSH is not a "party". -- A "party" is identified by a "partyId" (i.e. each partyId denotes one specific "party". -- There is one CPA, between the "parties", so there isn't a separate CPA for the different paths shown in your figure 1-1. In your paper, you suggest using the Service and Action fields in order to figure out how to route the message. It seems to me that there is a tacit assumption behind this suggestion, which I think needs to be made explicit. It assumes that you never have two distinct MSH's within one "party" that both implement the same Service/Action. Is this really a safe assumption? If a "party" might be a large corporation, the corporation could have many divisions, each of which provides the service "Purchasing" with the action "Submit PO". It seems to me that Service & Action are an assertion about *what* to do, not *who* is doing it. For routing, we want to use "who-like" information.
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