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RE: Coordinated Choreographies Proposal 6 - Extending Choreographies

From: Haugen Robert <Robert.Haugen@choreology.com>
Date: Wed, 10 Nov 2004 14:04:45 -0000
Message-ID: <221369570DEDF346AE42821041345E8951BC73@imap.choreology.com>
To: "Monica J. Martin" <Monica.Martin@Sun.COM>
Cc: <public-ws-chor@w3.org>
Monica J. Martin wrote:
> Haugen Robert wrote:
> >Monica J. Martin wrote:
> >  
> >
> >>In thinking about nested choreographies, you could have a
> >>child derived from a parent OR a child that is dependent on 
> a parent but 
> >>not extended from it. Can we address either case (Proposal 
> 6 includes the former only).
> >>    
> >>
> >Proposal 6 is only trying to address the former case, which does not 
> >exist now in CDL.
> >
> >I'm not sure what you mean by the latter:
> >the relationship of an inner choreography to an enclosing 
> one, or the 
> >relationship between one choreography that performs another?
> >I think both do now exist in CDL,
> >and are essentially the same,
> >although proposal 4 puts a new wrinkle on both.
> >
> >  
> >
> mm1: The difference is that a child can not be run standalone 
> but must 
> be in an enclosing choreography. It is not extended from the 
> enclosing 
> choreography nor necessarily performed (from another choreography, 
> location, etc.) although it could be. Note, one child may be 
> or may not 
> be restricted to use in a choreography package (the restriction is a 
> constraint rather than evidence of the choreography or choreography 
> fragment's construction). An example would be a loan assessor 
> choreography that evaluates risk of guaranteeing a customer 
> including a 
> credit check.  The loan assessment could be run as a separate 
> choreography but in our particular scenario it must be run only in a 
> bank loan application choreography because of constraints 
> applied by the 
> loan policies.

BH2: "Child choreography" in Proposal 6 is an inheritance relationship.
The result is single choreography merging features or parent and child.

You're using "child choreography" in a different, but valid, sense.

I adopted the words "parent" and "child" in proposal 6 because they did
not exist in the CDL spec, and so I thought I could pre-empt their

If not - if prop 6 passes and you wish to use "child" with a different
meaning - we may need to negotiate or straw-vote.  I'm open to other

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