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   Re: [xml-dev] RDDL and WSDL

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On Thu, 30 Jan 2003 11:58:17 -0500, Simon St.Laurent 
<simonstl@simonstl.com> wrote:

> Could you explain this one a bit more?

Wild shot in the dark:   WSDL identifies the machine-processable syntax of 
the interaction between a web service provider and consumer.  RDDL provides 
a human readable description of the semantics of the service (and 
potentially a machine processable description, if RDDL stays in the RDF 
realm and an instance contains or points to a rich RDF description.

Clearly both the semantic understanding and the syntax of the interaction 
are needed.  David Booth has a great paper (I hope I'm not jumping the gun 
by pointing the world to it!) that emphasizes that humans, and semantic 
understanding of what the page/service/etc. that a URI signifies, are 
necessary components of a Web services architecture.  

In my opinion, which seems to be shared by many people on the WSA WG, FWIW, 
The Web As We Know It is "Scenario 0" in David's framework:  The semantics 
of the "service" are negotiated totally out of band or inmplicitly 
understood by a human reading the page, and the "web service description" 
consists solely of the URI.

The Semantic Web could be Scenario N in his framework, where the semantic 
descriptions are machine processable and somehow tie into the syntactic 
description of the web page or service invocation in a way that a machine 
could infer.

Whether or not David's framework can be made to work in a formal 
architecture, it represents the SPIRIT of what I think is needed -- 
integrating the Web, Web services, and the Semantic Web viewpoints as 
special cases of one another rather than as alternate "paradigms" that must 
be accepted or rejected as dogma.


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