RDF Concepts

Assigned

PFPS, "Can RDF say anything about anything?"

» See document: http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0148.html
» See also: PFPS, "What is the expressive power of RDF?"

• Brian responds
• Eds to pick up
• 110-SayAnything
• My notes on test cases
• GK: to review and raise new issue if needed
• NOT pfps-15
• Assigned pfps-22
• Assigned pfps-23
• See Email 2003-03-14

Brian responds

» See document: http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0165.html

Eds to pick up

A comment with some favourable response:

  http://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2003Feb/0092.html

110-SayAnything

My notes on test cases

[2] http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0175.html

With respect to your examples in [2]:

<rdf:ID rdf:about="#IDinstance">

<rdfs:comment>An instance of rdf:ID.</rdfs:comment>

</rdf:ID>

I think this is syntactically illegal.

...

A better example, perhaps, would be using RDF to critique RDF, as in

<rdfs:Class rdf:about="#broken">

  <rdfs:comment>The class of broken features in RDF.</rdfs:comment>

</rdfs:Class>

<broken rdf:about="http://www.w3.org/1999/02/22-rdf-syntax-ns#ID">

  <rdfs:comment>rdf:ID is broken because it can only occur once in

       an rdf document.</rdfs:comment>

</broken>

<broken rdf:about="http://www.w3.org/2000/01/rdf-schema#comment">

  <rdfs:comment>rdfs:comment is broken because it brings in social

     meaning.</rdfs:comment>

</broken>

I think the first and third parts are fine, and the second part is a syntactically illegal use of rdf:ID.

...

A third example, would be to use one of the RDF URIs as a property, as in:

<rdf:Property rdf:about="http://www.w3.org/1999/02/22-rdf-syntax-ns#ID">

  <http://www.w3.org/1999/02/22-rdf-syntax-ns#ID

    rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#ID"/>

</rdf:Property>

I think this is syntactically illegal.

...

PS:  On a related note, is

rdfs:Class rdfs:Class rdfs:Class .

allowed?

I would say this is syntactically legal, but unsatisfiable, as RDF(S) does not define any use of rdfs:Class as a property.

GK: to review and raise new issue if needed

NOT pfps-15

» See document: http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0470.html

Assigned pfps-22

» See document: http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0471.html

Assigned pfps-23

» See document: http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0472.html

See Email 2003-03-14