RE: Metamodel meeting 21 Nov.

[Karsten Riemer - Sun IR Development <Karsten.Riemer@East.Sun.COM>]

Bob,
as you said, you weren't at Tokyo, and you haven't seen the latest model,
so I would prefer to defer any further discussion on your comments until you 
have seen and understood the Tokyo model.

As to the goal you stated: to provide a straightforward mapping from the 
existing metamodel to a single layer that drives the runtime software. We 
provide that.
 
Jim Clark, to my knowledge, never provided a simplified runtime model. He 
provided an XML mapping that would require users to create pointers to the 
various places in the 4 layers that are required for TP. That would again 
require a user to first construct the 4 layers, and then create the pointers to 
them. That is the part that must be optional. You should have a clear choice of 
whether you want to create your model by guided steps through the 4 layers, or 
by specifying it directly in the single layer, i.e. in the specification 
metamodel. 

I never said that the "methodology metamodel" is superfluous. It is needed for 
the people that want the guided tour through the 4 layers. The "specification 
metamodel" is needed for people who don't, or who have already established their 
models and just need to convert it to the ebXML format. 

-karsten


> >From: Bob Haugen <linkage@interaccess.com>
> >To: "'Karsten Riemer'" <Karsten.Riemer@east.sun.com>, Jim Clark 
<jdc-icot@lcc.net>
> >Cc: "ebxml-bp@lists.ebxml.org" <ebxml-bp@lists.ebxml.org>, 
"ebxml-cc@lists.ebxml.org" <ebxml-cc@lists.ebxml.org>, "cory-c@dataaccess.com" 
<cory-c@dataaccess.com>, "alonjon@mega.com" <alonjon@mega.com>
> >Subject: RE: Metamodel meeting 21 Nov.
> >Date: Tue, 21 Nov 2000 07:34:29 -0600
> >MIME-Version: 1.0
> >
> ><Karsten Riemer>
> >A response to Jim Clark's e-mail on this topic:
> >We are not defining a new metamodel
> ></Karsten Riemer>
> >
> >Karsten, here are some reasons why some of us think it is 
> >a new metamodel:
> >
> >1. The first couple of versions had significant differences
> >    from any reasonable derivation of the current metamodel:
> >    * different method of sequencing
> >    * different way of modeling recursive processes
> >    * missing concepts (that should have been there)
> >    * in other words, not what one would get in a straightforward
> >      derivation of the current metamodel.
> >    I was not in Tokyo and have not seen your current version,
> >    so maybe these problems were resolved.  But they made
> >    your metamodel different from a design standpoint, so as
> >    to require a complex mapping rather than a simple one,
> >    and block some potentials of the current metamodel
> >    from being expressed (or at least I could not figure out
> >    how to express them).
> >
> >2. As Tony Weida pointed out, your terminology ("specification
> >   metamodel") and positioning comments made it seem like yours 
> >   was the specification and the existing metamodel was superfluous 
> >   and optional.
> >   This is a problem because a lot of other work (e.g. Common
> >   Business Processes and what I am doing with the Economic
> >   Elements) is based on the current metamodel.
> >
> >A question:  Jim Clark also provided a simplified runtime model,
> >that was a straightforward derivation from the current metamodel.
> >What happened with that model in Tokyo? Was it ignored?
> >
> >-Bob Haugen------ =_NextPart_000_01C0538D.8D179140
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---------------------------------------------------
Karsten Riemer,
Director, Information Architecture,
Enterprise Management Architecture Group
Sun Microsystems Inc.,
MailStop UBUR03-313
1 Network Drive,
Burlington, MA 01803-0903

ph. 781-442-2679
fax 781-442-1599
e-mail karsten.riemer@sun.com