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Re: URIRefs are not "opaque" identifiers; mapping RDF substructure to KIF

From: Sandro Hawke <sandro@w3.org>
Date: Thu, 26 Sep 2002 04:30:36 -0400
Message-Id: <200209260830.g8Q8Ua129737@wadimousa.hawke.org>
To: "Patrick Stickler" <patrick.stickler@nokia.com>
cc: phayes@ai.uwf.edu, mbatsis@netsmart.gr, www-rdf-interest@w3.org

> > 
> > > Also, URIs are fully opaque to the RDF MT, and we needed for
> > > the datatype and lexical form components to be visible to the
> > > MT, hence a new node type that does not have quite the level
> > > of opacity as URIrefs.
> > 
> > URIrefs are not opaque identifiers.  They have substructure which is
> > open to examination and is an Internet Draft Standard.  (Every web
> > browser has to use it, of course.)
> 
> They are opaque to the RDF MT and are treated simply as
> names. Yes, applications operating above the level of the
> RDF MT are free to look into URIs and interpret them according
> to their internal structure, but inference engines and other
> generic tools operating on an RDF graph based on the RDF MT
> may not do so.

Agreed (give or take some wrangling about what "other generic tools"
might mean).  So yes, they are opaque at the generic RDF layer, and
are passed through intact to higher layers.   

    -- sandro
Received on Thursday, 26 September 2002 04:32:40 GMT

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