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RE: Survey Catalysis

• From: "Fabio Arciniegas A." <l-arcini@u...>
• To: xml-dev@i...
• Date: Wed, 29 Dec 1999 13:46:46 -0500 (GMT+5)

Well, I think there are three points of view here and basically three 
analogies with traditional patterns:

1. The relation between the result of the mapping and the third party 
interested in the final product: As you said this would be an "Adapter":
The third party expects a certain interface and an existing product is adapted
to conform to it.

2.The relation between the mapped element and the architectural form: this
is -as Didier noted- an "Interface" ("Marker Interface"[Larman] maybe
would be more appropriate, since there purpose of the mapping is to signal the mapped 
product as something)

3.The Architecture structure as a "Model Template". (This is the way I 
originally understood the survey, because of the reference to  Catalysis 
notion of framework). The Architecture provides a structure that is
specialized via the mapping of other constructs to the template.

Best,
	Fabio

> I think an even better match from programming is the "Adapter" pattern
from
> GoF[1].  To quote from the book an Adapter is used to "Convert the
interface of
> a class into another interface clients expect.  Adapter lets classes
work
> together that couldn't otherwise because of incompatible interfaces."
> If you change "class" to "document type" in the above, I think this
gives a
> perfect description of the intent of document architectures.
> 
> Toivo Lainevool
> 
> [1] Design Patterns: Elements of Reusable Object-Oriented Software.
Gamma,
> Helm, Johnson, Vlissides.

--
Fabio Arciniegas A.		        Viaduct Technologies, Inc.
fabio@v...			Software Engineer
Interests: XML, Wittgenstein and just about everything in between.
Oblique Strategy of the day: 	      "Abandon normal instruments"

--
Fabio Arciniegas Arjona              
l-arcini@u...            
                                


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