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[Jonathan Borden
> One is _expected_ to use a network-retrieving URI as an identifier for an
> OWL ontology. The OWL ontology construct:
>
> <owl:Ontology rdf:about="">
> <owl:versionInfo>v 1.17 2003/02/26 12:56:51 mdean</owl:versionInfo>
> <rdfs:comment>An example ontology</rdfs:comment>
> <owl:imports rdf:resource="http://www.example.org/foo"/>
> </owl:Ontology>
>
> is used to make assertions about the 'current URI'. Moreover, the fact
that
> OWL ontologies are network retrievable (have URIs) is used to import one
> ontology into another <owl:imports>
I don't think what I said conflicts with this, Jonathan. Well, OK, maybe a
little. I suggested not using a retrievable URI as a node identifier, in
the interests of avoiding possible ambiguity in the intended usage of the
URI. If that ambiguity is removed in a particular case by the
specification, fine, then no help is needed from the convention.
The owl:imports is a special case because the URI is required to be
retrievable. But also, the Rec [1] does not actually say that the URI is
the identifier of a node that represents the imported ontology, just that
its graph can be gotten from the URI -
" Each reference consists of a URI specifying from where the ontology is to
be imported. "
In my mind, rdf:about='' does not exactly indicate a retrievable resource,
although of course at one time it may or may not have been retrieved (maybe
not, if the whole thing was created or modified inside an application). But
to help me understand this particular point better, please answer this
question for me -
Is it allowed in OWL - or at least does to make sense to you - to reference
some other resource besides the current document in the owl:ontology
rdf:about attribute? Example -
<owl:Ontology rdf:about='http://example.com/ontology1'>
<owl:versionInfo>v 1.17 2003/02/26 12:56:51 mdean</owl:versionInfo>
....
</owl:Ontology>
Aside from this special case, and I suppose there are a few others lurking
around, do you see other situations where it would be important to use an
actual retrievable URI as an RDF node identifier?
Cheers,
Tom P
[1] OWL Web Ontology Language Reference,
http://www.w3.org/TR/owl-ref/
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