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Re: Members of the rdfs:ContainerMembershipProperty class

From: Dan Brickley <danbri@w3.org>
Date: Tue, 10 Sep 2002 07:59:44 -0400 (EDT)
To: pat hayes <phayes@ai.uwf.edu>
cc: Nick Bassiliades <nbassili@csd.auth.gr>, <www-rdf-comments@w3.org>
Message-ID: <Pine.LNX.4.30.0209100759210.9124-100000@tux.w3.org>


I don't remember abandoning it! (but memory can play tricks...)

Dan

On Fri, 6 Sep 2002, pat hayes wrote:

> >I would like to ask about the use of the class
> >rdfs:ContainerMembershipProperty class.
> >
> >In the RDF Schema document
> >(<http://www.w3.org/TR/rdf-schema/#ch_containermembershipproperty>http://www.w3.org/TR/rdf-schema/#ch_containermembershipproperty)
> >is mentioned that:
> >
> >>The rdfs:ContainerMembershipProperty class has as members the
> >>property rdfs:member and the properties _1, _2, _3 ... that can be
> >>used to indicate membership of Bag, Seq and Alt containers.
> >>rdfs:ContainerMembershipProperty is a subclass of rdf:Property.
> >>Each container membership property is a rdfs:subPropertyOf the
> >>rdfs:member property.
> >>
> >However, in the RDF Model Theory document
> >(<http://www.w3.org/TR/rdf-mt/#rdfs_entail>http://www.w3.org/TR/rdf-mt/#rdfs_entail)
> >the 2nd rule of the rdfs-closure of an RDF graph states that the
> >following triples are true:
> >
> >>[rdf:_1] [rdf:type] [rdfs:Property] .
> >>[rdf:_2] [rdf:type] [rdfs:Property] .
> >>...
> >>
> >>[rdf:_1] [rdfs:subPropertyOf] [rdfs:member] .
> >>[rdf:_2] [rdfs:subPropertyOf] [rdfs:member] .
> >>...
> >>
> >However, since rdf:_XXX properties are members of the class
> > rdfs:ContainerMembershipProperty the first group
> >of the above triples shouldn't better be as follows?
> >
> >[rdf:_1] [rdf:type] [rdfs:ContainerMembershipProperty] .
> >[rdf:_2] [rdf:type] [rdfs:ContainerMembershipProperty] .
> >...
>
> To the best of my recollection, the WG had decided to abandon
> ContainerMembershipProperty, which is why I didn't use it. But I will
> check to make sure. Certainly if it is still in the language then
> your suggestion is a good one.
>
> Pat Hayes
>
Received on Tuesday, 10 September 2002 07:59:49 GMT

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