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Re: RDDL and WSDL

• To: "Xml-Dev@Lists. Xml. Org (E-mail)" <xml-dev@l...>
• Subject: Re: RDDL and WSDL
• From: Mike Champion <mc@x...>
• Date: Thu, 30 Jan 2003 12:26:01 -0500
• In-reply-to: <r01050400-1023-078BC1DC347411D791DA0003937A08C2@[192.168.124.11]>
• References: <r01050400-1023-078BC1DC347411D791DA0003937A08C2@[192.168.124.11]>
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On Thu, 30 Jan 2003 11:58:17 -0500, Simon St.Laurent 
<simonstl@s...> 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.  
http://www.w3.org/2002/ws/arch/2/10/roles_clean.htm

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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