From: Brandon Amundson (bamundson@bbn.com)
Date: 07/11/02
-----Original Message----- From: Luís Mota [mailto:luis.mota@iscte.pt] Sent: Wednesday, July 10, 2002 2:06 PM To: daml-help@daml.org Subject: Question on containers Hi everyone. Hope you can help on this one, because my knowledge of DAML+OIL and RDF is not perfect, and I have a very specific question. I'm developing an ontology for the AgentCities project. Somewhere in my onlology, I need to express that one class is a sequence/list of instances of another class. In the DAML walk-thru, collections are used, but not as sequences, and without any restriction concerning the class of the elements in the collection. Anyway, I looked at tge RDFSchema definition, and I think that I found a way of expressing what I want. I'm simply not sure if this is correct. Therefore, I would ask you if someone could take a look at my definition and give me his opinion... Let's say I have somo class defined in my ontology. In my example, it's a CartographicLocation, ie, a point on a map: <daml:Class rdf:ID="CartographicLocation"> <rdfs:comment>This class represents a geographic location, defined on a cartesian projection system.</rdfs:comment> <rdfs:subClassOf rdf:resource="#Location"/> </daml:Class> Now, I want to define a class which is a sequence of cartographic locations. I think this can be done like this: <rdfs:Class rdf:about="CartographicLocationSeq"> <rdfs:subClassOf rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq"/> <rdfs:comment xml:lang="en">An ordered collection of Cartographic Locations.</rdfs:comment> <rdfs:subClassOf > <daml:Restriction> <daml:onProperty rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#member"/> <daml:toClass rdf:resource="#CartographicLocation"/> </daml:Restriction> </rdfs:subClassOf > </rdfs:Class> This means (as far as I can see) that the range of the member property must, in this class, be a CartographicLocation. Is this correct? Well, I'll appreciate any comment on this... Best regards, Luís Mota
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