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Re: many-to-many

functionalproperty rdf
John Cowan wrote:
> "Emmanuil Batsis (Manos)" scripsit:
> > The usability of anonymous nodes can be overrated as they don't have a
> > URI serving as a global unique identifier (and potentialy locator) for
> > them.
> Indeed.  One would have to impose a higher-order rule that says "two
> with identical subjectIndicator properties are to be treated as
> as indeed they do in the TM world.

Yes, actually this is where owl:FunctionalProperty and
owl:InverseFunctionalProperty come in.

In the above the property "subjectIndicator" would be defined as

<owl:FunctionalProperty rdf:ID="subjectIndicator" />

and hence if you had the following:

#a :subjectIndicator #foo .
#b :subjectIndicator #foo .

you could conclude that:

#a owl:sameIndividualAs #b

> > The right thing to do would be to use a non-retreivable scheme URI
> > (perhaps a URN?) (or an rdf:ID) to denote Shakespeare, as one cannot
> > simply download him. His picture should be mentioned as just that, not
> > as the person itself. Anonymous nodes are not needed to avoid confusion:
> >
> > <rdf:Description rdf:about="nonRetreivable://Persona/Shakespeare">
> >     <foo:picture rdf:resource="http://URL/to/pic"/>
> > </rdf:Description>
> The rdf:ID to which you refer is the b-node/anonymous node I was talking
> about in the first place.

for example:

<owl:FunctionalProperty rdf:ID="ssn" >
    <rdfs:domain rdf:resource="#Person" />

then the following:

    <ssn rdf:resource="#000-11-1234" />
    <haircolor rdf:resource="#blond" />

and somewhere else:

    <ssn rdf:resource="#000-11-1234" />
    <nosering rdf:resource="#large"/>

you could conclude that these two (anonymous) persons are the same
individual. If you think about it, this is a totally powerful facility --
and rather useful.



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