RE: Terminology Question

I agree also especially as MEPs are likely to be reusable components that
are part of a longer "conversation".
 
David

-----Original Message-----
From: Christopher B Ferris [mailto:[email protected]]
Sent: Monday, February 24, 2003 5:00 AM
To: [email protected]
Subject: RE: Terminology Question



+1, an MEP is not supposed to extend to the likes of a conversation. I think
that we 
should limit as Amy/Arkin suggest, to capture the basic communication idiom.


Cheers, 

Christopher Ferris
Architect, Emerging e-business Industry Architecture
email: [email protected]
phone: +1 508 234 3624 

[email protected] wrote on 02/23/2003 07:13:59 PM:

> David, 
>   
> I was about to raise an issue regarding the use of MEP in the WSA
document. 
>   
> A message exchange pattern can be as simple as a WSDL operation, but in
fact can also be as 
> complex as a long-lasting multi-party choreography. Unless we restrict the
definition of MEP, I 
> would say that Wsb services choreography also addresses MEPs and MEP is
just another way to define
> a conversation. And in fact several people have proposed extending MEPs to
the point where they 
> tread into the space of choreography. 
>   
> I suggest that we formally define WSDL as capturing a specific type of MEP
which, as Amy said 
> before, attempts to capture the basic communication idioms (synch, asynch,
unicast and multicast) 
> with the restriction that each WSDL MEP contains the minimal number of
messages required for such 
> an idiom. A choreography language would then provide more complex MEPs
using these communication idioms. 
>   
> arkin 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
Behalf Of Burdett, David
> Sent: Sunday, February 23, 2003 3:56 PM
> To: [email protected]; [email protected]
> Subject: RE: Terminology Question

> For what it's worth here's are my ideas based on what other groups such as
ebXML and WS 
> Choreography tend to use (I am off-line and so can't quote) Really there
are two levels: 
> 1. Message Exchange Patterns are a short exchange of messages such as
one-way or request-response,
> together with associated acknowledgement/receipt messages. 
> 2. A Conversation consists of a combination of Message Exchange Patterns
where all the messages 
> are related in some way. 
> The word "Conversation" is used because the exchange of information can
consist of an 
> indeterminate number of exchanges of information as in a real conversation
between people. A 
> classic example of a conversation is the sequence of messages exchanged to
place and/or change an order: 
> BUYER                     SELLER 
>        Order --------> 
>              <-------- Order Response 
> Change Order --------> 
>              <-------- Change Order Response 
> ... repeat change order as required ... 
> Cancel Order --------> (only if required) 
>              <-------- Cancel Order Response 
> Thoughts? 
> David 
> 

> -----Original Message----- 
> From: [email protected] [mailto:[email protected]] 
> Sent: Friday, February 21, 2003 1:59 PM 
> To: [email protected] 
> Subject: RE: Terminology Question 
> 

> So the collection of messages that manifest the exchange would be 
> called... 
> Jim Murphy 
> Mindreef, Inc. 
> http://www.mindreef.com 
> 

> > -----Original Message----- 
> > From: [email protected] [mailto:[email protected]] 
> On 
> > Behalf Of Francis McCabe 
> > Sent: Friday, February 21, 2003 4:34 PM 
> > To: [email protected] 
> > Cc: [email protected] 
> > Subject: Re: Terminology Question 
> > 
> > 
> > This is a message exchange pattern 
> > 
> > On Friday, February 21, 2003, at 01:30  PM, <[email protected]> 
> > wrote: 
> > 
> > > 
> > > Speaking of definitions, what term are folks using to describe the 
> > > collection of messages that occur when an operation is invoked.  For 
> > > the 
> > > typical input/output operations you would have 2, a request and a 
> > > response. In a one-way you would have 1, in a solicit response you 
> > > would 
> > > have n etc. 
> > > 
> > > What moniker would y'all recommend for this collection: 
> > > 
> > > 1.  Exchange 
> > > 2.  Conversation 
> > > 3. ??? 
> > > 
> > > Something that indicates the fact that these messages are part of 
> the 
> > > same operation is the critical part for me. 
> > > 
> > > Thanks. 
> > > 
> > > Jim Murphy 
> > > Mindreef, Inc. 
> > > http://www.mindreef.com 
> > > 
> > >