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Re: Members of the rdfs:ContainerMembershipProperty class

From: pat hayes <phayes@ai.uwf.edu>
Date: Fri, 6 Sep 2002 03:09:06 -0700
Message-Id: <p05111b15b99e2e218a20@[65.212.118.251]>
To: Nick Bassiliades <nbassili@csd.auth.gr>
Cc: www-rdf-comments@w3.org
>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
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Received on Tuesday, 10 September 2002 04:36:08 GMT

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