Re: RDF vocabulary definitions

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 Russell