1. hierarchy vs. lattice Hierarchies and lattices are defined by a species-genus relation, e.g. man iss animal In a class hierarchy, all classes have a unique genus, and all subclasses are disjoint. In a class lattice, some classes have multiple genus, and some subclasses are not disjoint. A proper set of genus-differentia definitions will define a class hierarchy. If you use a conflicting set of contexts, you will get a lattice instead. 2. New property? No, rdfs:subClassOf (alias iss*) already does that KR iss does it better ============ Dick McCullough knowledge := man do identify od existent done knowledge haspart list of proposition ----- Original Message ----- From: Seth Russell To: rdfig Sent: Thursday, November 21, 2002 1:02 PM Subject: Re: RDF vocabulary definitions Richard H. McCullough wrote: <<With RDFS Classes, it's really a lattice, but: (a)that's too much technicaldetail for an introduction; (b)many people don't even realize that there's a difference between the two -- they use the word "hierarchy" when referring to a "lattice".>> Could you elaborate on the distinction between a heirachy and a lattice ? Do you think we should invent a new property to place a class within a lattice of properties? Seth RussellReceived on Thursday, 21 November 2002 17:45:55 UTC
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