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Re: Co-operating with Architectural Forms

• To: xml-dev@l...
• Subject: Re: Co-operating with Architectural Forms
• From: Pete Kirkham <pete.kirkham@b...>
• Date: Fri, 01 Feb 2002 11:43:24 +0000

Gavin Thomas Nicol wrote:
> > The name is not the same as the thing. I think the whole idea that gi
> > == type to be one of the biggest peices of misinformation around.

Paul Prescod wrote:
> The GI is the name of the type. Of course a name is not the same as the
> thing. Depending on how you look at the universe the "real type" is a
> totally abstract construction or a thing defined in a DTD.

Or if you're used to using XMLSchema, then the mapping from tagname/GI to element 
type is defined by the parent element's element type as well; so you're aware that 
they are not one_and_the_same. 

How element type maps to abstract type is the next level up.

AFs map from one encoding of your abstract information to the one you consider 
canonical, and back.

There seems to be a gap for a mechanism that which maps an encoding to an 
architecture; for example:

From a EXPRESS information model one can generate a standard encoding for the data 
associated with instances of that model's entities by following the rules in the 
spec.  

Presumably this could be done with appropiate tools. 

This mapping is not part of XML syntax, not part of the schema, and non-standard 
encodings may not even have a one to one mapping of EXPRESS:entity type to XML:
element type.

As far as data exchange goes, it is only necessary to map the instance document to 
a form that the next tool can use, so the AF/ standard encoding approach suffices.

Pete Kirkham



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