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   RE: [xml-dev] Ontolgies, Mappings and Transformations (was RE: Web Servi

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  • To: "Ronald Bourret" <rpbourret@rpbourret.com>,<xml-dev@lists.xml.org>
  • Subject: RE: [xml-dev] Ontolgies, Mappings and Transformations (was RE: Web Services/SOA)
  • From: "Dare Obasanjo" <dareo@microsoft.com>
  • Date: Wed, 1 Dec 2004 08:26:39 -0800
  • Thread-index: AcTXbnBUq0UfgEqMS8qOC+hBglOKJgAU1oMV
  • Thread-topic: [xml-dev] Ontolgies, Mappings and Transformations (was RE: Web Services/SOA)

I should give a practical example of what I mean. Imagine if RSS 2.0 was an RDF vocabulary and you wanted to map it to RSS 1.0. In RSS 2.0 the pubDate value is an RFC 822 formatted date while in RSS 1.0 the dc:date field usually used to indicate dates is in the ISO 8601 format. Semantic Web technologies generally allow me to say <pubDate> is logically equivalent to <dc:date> but an application needs more than that. If it can only consume ISO 8601 dates (e.g. if it is a .NET Framework application using the System.DateTime class) then simply saying 'treat <pubDate> like <dc:date>" is not enough. You will need to write some real code to do this transformation. 
There is nothing more satisfying that having someone take a shot at you, and miss. 


From: Ronald Bourret [mailto:rpbourret@rpbourret.com]
Sent: Tue 11/30/2004 10:23 PM
To: xml-dev@lists.xml.org
Subject: Re: [xml-dev] Ontolgies, Mappings and Transformations (was RE: Web Services/SOA)

Dare Obasanjo wrote:

>  However the Semantic Web
> related mapping technologies don't allow for the kind of complex and
> messy mappings that occur in the real world.

Then what's the point? I should have hoped that Semantic Web
technologies (and ontologies in particular) would have allowed me to say:

1) Here's a general concept.

2) Here's how you get there from my particular expression of that concept.

Without this, we'll never be able to automatically exchange / integrate
information, since we'll never agree on a single set of metadata for a
particular concept.

-- Ron

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