RE: [soa-rm] Groups - Rough notes taken during the last ebSOAmeeting. (ebSOA-Elements.pdf) uploaded

[Rex Brooks <rexb@starbourne.com>]

Data Models do include the notion of Semantics inherently, but as Joe 
points out, it seems out of scope for this RM. However, we do need to 
consider Semantic concerns for how we define and classify, if we 
classify, Services.

Ciao,
Rex

At 7:39 AM -0500 3/31/05, Chiusano Joseph wrote:
><Quote>
>An open ended question is "does the data model
>include the notion of semantics?".  I would like to hear comments back
>on this matter.
></Quote>
>
>I wonder if the answer to this question has any bearing on our RM, or if
>it is out of scope no matter what the answer is? 
>
>Kind Regards,
>Joseph Chiusano
>Booz Allen Hamilton
>Visit us online@ http://www.boozallen.com
>
>
>>  -----Original Message-----
>>  From: Duane Nickull [mailto:dnickull@adobe.com]
>>  Sent: Wednesday, March 30, 2005 7:33 PM
>>  To: Metz Rebekah
>>  Cc: soa-rm@lists.oasis-open.org
>>  Subject: Re: [soa-rm] Groups - Rough notes taken during the
>>  last ebSOA meeting. (ebSOA-Elements.pdf) uploaded
>>
>>  Hi Rebekah:
>>
>>  Some comments inline:
>>
>>  Metz Rebekah wrote:
>>
>>  >All -
>>  >
>>  >I have another 25 messages to go before I catch up with all
>>  the traffic
>>  >on the list, so I apologize if my comments are already outdated.
>>  >
>>  I would recommend reading Thomas's elegant summary - it may
>>  save you some time ;-)
>>
>>
>>  >Respecting the service description, contract, and data model from
>>  >Duane's message - does you think that "all aspects of the service"
>>  >encompasses the service interface and the policy?  I like
>>  the use of the
>>  >term service contract, but have seen several interpretations
>>  of the term
>>  >ranging from semantics ("what is meant") to syntax (vis a
>>  vis the WSDL)
>>  >and also that the WSDL is the data model is the contract.  I
>>  would argue
>>  >that the contract is the same as the data model.  However,
>>  I'd have to
>>  >think a bit more to provide a convincing argument rather than simply
>>  >positing an idea.
>>  > 
>>  >
>>  The data model is the abstract concept of what data you will
>>  pass in and
>>  out of a service.  An open ended question is "does the data model
>>  include the notion of semantics?".  I would like to hear
>>  comments back
>>  on this matter.
>>
>>  >Continuing into the message, I would disagree with the following:
>>  > 
>>  >
>>  >>If I build something and that is "Service Oriented"
>>  >>architecturally, does it have to have a "message"?  No - the
>>  >>service itself has a mechanism that allows a service consumer
>>  >>to bind to it to invoke the service but it doesn't actually
>>  >>have to be invoked for it to be "service oriented
>>  >>architecture". 
>>  >>   
>>  >>
>>  >
>>  >I would argue that conceptually, a message exists.  <SNIP>
>>  >
>>
>>  Try to think abstract.  If you think concrete - then the
>>  answer is yes,
>>  however the reference model is not concrete.  No other
>>  reference models
>>  use messages by convention either.  If you find one that is well
>>  scrutinized and accepted by peers, please let me know.
>>
>>  >The mechanism by
>>  >which the consumer binds to the service and invokes it
>>  constitutes the
>>  >message.
>>  >
>>  Conceptually - yes.  The "service" element of the SOA RM draft on the
>>  position paper includes the concept of a binding.  A physical message
>>  does not have to be sent.  When using the RM to write a concrete SO
>>  infrastructure architecture, one would recognize that a
>>  message protocol
>>  would likely be needed to be specified, along with several
>>  other items
>>  like security, potentially some sort of state management
>>  (like BPM), etc
>>  etc.
>>
>>  I hope this helps a bit.
>>
>>  Duane
>>
>>  --
>>  ***********
>>  Senior Standards Strategist - Adobe Systems, Inc. -
>>  http://www.adobe.com
>>  Vice Chair - UN/CEFACT Bureau Plenary - http://www.unece.org/cefact/
>>  Adobe Enterprise Developer Resources  -
>>  http://www.adobe.com/enterprise/developer/main.html
>>  ***********
>  >
>>


-- 
Rex Brooks
President, CEO
Starbourne Communications Design
GeoAddress: 1361-A Addison
Berkeley, CA 94702
Tel: 510-849-2309