Multiple occurence of rdfs properties

I would like to ask if there any constraints on the multiple occurence 
(cardinality)
of rdf- and rdfs-defined properties about the same resource.

For example, the following properties are by-now widely known to have 
multiple occurences:

rdf:type    (member of multiple class)
rdfs:subClassOf    (multiple inheritance - although I know that there is 
really nothing inherited!)
rdfs:subPropertyOf    (a kind of multiple inheritance for properties)
rdfs:range, rdfs:domain    (restrictions of properties to members of 
intersection of multiple classes)

Now, the following rdf and rdfs properties have not been extensively 
discussed in the mailing lists and their
cardinality is not discussed in the RDF docs:

rdfs:label
rdfs:comment
rdfs:seeAlso   (its intuitive meaning calls for multiple-occurence 
semantics)
rdfs:isDefinedBy
rdf:Value        (should occur once, but I may be missing something)
rdf:statement, rdf:predicate, rdf:object     (should occur once, for 
each statement)

-- 
**************************************************************
* Dr. Nick Bassiliades                                       *
*                                                            *
* Programming Languages And Software Engineering (PLASE) Lab *
* Logic Programming and Intelligent Systems (LPIS) Group     *
*                                                            *
* Dept. of Informatics, Aristotle University of Thessaloniki *
* 54006 Thessaloniki, Greece                                 *
*                                                            *
* Tel: +30310998418    E-mail: nbassili@csd.auth.gr          *
* Fax: +30310998419    URL:    http://www.csd.auth.gr/~nick  *
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Received on Thursday, 29 August 2002 05:36:28 UTC