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Modelling rdfs:range(s) in PRISM

From: Hammond, Tony <T.Hammond@nature.com>
Date: Wed, 1 Sep 2004 12:19:02 +0100
Message-ID: <125F7834E11A5741A7D79412EE3504F90CE55857@UK1APPS2.nature.com>
To: "'www-rdf-interest@w3.org'" <www-rdf-interest@w3.org>

Hi:

I seem to have a problem with modelling rdfs:ranges in the PRISM RDF schema
- see http://www.prismstandard.org/resources/prism.rdfs (and thanks to
Victor at SchemaWeb for pointing this out).

The PRISM spec
(http://www.prismstandard.org/specifications/Prism1[1].2RFC.pdf) defines a
small number of parameter entities for use in content models, e.g.

	%AuthorityReference;

which is a URI in a controlled vocab.

Now for a given element, prism:category, say it defines a content model of
either

	rdf:resource=%AuthorityReference;  i.e. rdf:resource=URI

if an %AuthorityReference; URI is available or if no %AuthorityReference;
URI is available then the prism:category element content is #PCDATA.  

I attempted to model this as

<!-- "AuthorityReference" class -->
<rdfs:Class rdf:ID="AuthorityReference">
<rdfs:label xml:lang="en-US">AuthorityReference</rdfs:label>
<rdfs:comment xml:lang="en-US">Resource used for PRISM content models with a
parameter entity %AuthorityReference; whose value is a URI referring to a
term in a controlled vocabulary.</rdfs:comment>
<rdfs:subClassOf rdf:resource="#ResourceReference"/>
</rdfs:Class>

<!-- prism:category -->
<rdf:Property rdf:about="category">
<rdfs:label xml:lang="en-US">category</rdfs:label>
<rdfs:comment xml:lang="en-US">The nature or genre of a resources
intellectual content.</rdfs:comment>
<rdfs:isDefinedBy rdf:resource=""/>
<rdfs:range rdf:resource="#AuthorityReference"/>
<rdfs:range
rdf:resource="http://www.w3.org/TR/2000/CR-rdf-schema-20000327#Literal"/>
</rdf:Property>

That is, I supplied two range elements - one for an %AuthorityReference; URI
and the other for #PCDATA. As Victor points out from the RDFS spec:

	"Where P has more than one rdfs:range property, then the resources
denoted by the objects of triples with predicate P are instances of all the
classes stated by the rdfs:range properties.

http://www.w3.org/TR/rdf-schema/#ch_range"

So looks like a property can have multiple ranges but they are AND'ed
instead of OR'ed. (Oh he also pointed out that I'm using the old schema
namespace - I'll upgrade that.) Question is, how do I model this optional
range constraint in RDFS without necessarily jumping up to OWL?

Thanks,

Tony



Tony Hammond

New Technology, Nature Publishing Group
4 Crinan Street, London N1 9XW, UK 

tel:+44-20-7843-4659
mailto:t.hammond@nature.com




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Received on Wednesday, 1 September 2004 11:19:35 GMT

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