Re: [xtm-wg] A challenge on "the graph"

["W. Eliot Kimber" <eliot@isogen.com>]

Murray Altheim wrote:
> 
> Sam Hunting wrote:
> [...]
> > [murray]
> > > We need a data model in order to describe a processing model.
> >
> > Please elucidate.
> 
> Amid all the hairpulling and bloodletting in Austin, the central message
> *I* pulled from everything was that TMQL and the processing model both
> need a data model, that is, a formal description of the underlying
> structure of the various components in a topic map. This can't be UML
> as this model cannot rely on notes. 

Let me repeat: UML HAS MATHEMATICAL CONSTRAINTS

You can use the OMG-defined object constraint language (OCL) or you can
use your own languag (John Heintz and I use a slightly modified version
of Python for this).

These constraints are specified constraints on classes, attributes,
methods, etc. For example, in ObjectDomain, the property editor gives
you a place to type in these constraints. 

These constraints cannot be expressed graphically, any more than prose
comments can be, but then they can't be expressed graphically in *ANY*
graphical notation.

Therefore, lack of mathematical constraint specification *CANNOT BE A
CRITERIA FOR ELIMINATING THE USE OF UML*. There may be other reasons,
but this cannot be one of them.

Cheers,

E.

-- 
. . . . . . . . . . . . . . . . . . . . . . . .

W. Eliot Kimber | Lead Brain

1016 La Posada Dr. | Suite 240 | Austin TX  78752
    T 512.656.4139 |  F 512.419.1860 | eliot@isogen.com

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