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Subject: Re: [soa-rm-ra] Service Interaction Visual Model (based ontoday's telecon discussion)

I think Message Exchange is a realization of Communicative Action. I 
would say that Message denotes Action. I would not include Event in 
this model unless there is a way to specify that an Event occurs upon 
the reception of a Message (which I don't think is possible in this 
diagram). For me, an Event only occurs in certain types of Message 
Exchange and may not require an exchange, although an "ack" would be 
a wise course so that the sender knows that the message has been 
received. Just my opinion. Also my opinion is that "conveys" should 
be taken to mean "transports" or "transmits."


At 1:31 PM -0700 6/4/08, Jeffrey A. Estefan wrote:
>Since many of you on the call this morning are security challenged 
>by your corporate firewalls, I'm uploading this to our Kavi site 
>This visual model is a first attempt to map from the higher level 
>abstract model describing Communicative Action and its relationship 
>to Interaction to a level of abstraction on par with the Realizing 
>SOAs View in which we map these concepts to Message Exchange and 
>Service Interaction, respectively.  This model or a variant of it 
>will need to be included in the Interacting with Services Model 
>section of the RA.  It's imperative that we come to some agreement 
>on this.  Michael has provided some models as well, which you can 
>see on the Kavi site.  They do not yet, however, reflect our 
>discussions/clarifications today with Frank.
>Here's how to "read" the visual model...
>Communicative Action is a specialization of Joint Action.  (Don't 
>know if we need to reflect that here yet again.  Perhaps.) 
>Communicative Action conveys Action and Event.  Interaction is 
>composed of Communicative Action.  Message Exchange is a 
>specialization of Communicative Action while Service Interaction is 
>a specialization of Interaction.  Service Interaction realizes 
>Message Exchange (or conversely, Message Exchange is realized by 
>Service Interaction).  [The note opens the question to you all on 
>whether or not this association should be a composition or a 
>realization.  (Incidentally, the dashed line with the open arrow 
>head denotes realization in the UML.)]  Message Exchange is composed 
>of one or more Messages.  A Message is composed of Structure and 
>Semantics, which are described in the Information Model.  A Message 
>is a medium of Service Interaction.  A Message also represents (or 
>denotes) Action and Event.
>Appreciate your comments!
>  - Jeff

Rex Brooks
President, CEO
Starbourne Communications Design
GeoAddress: 1361-A Addison
Berkeley, CA 94702
Tel: 510-898-0670

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