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Re: RDF Schema Question: range of values of an rdfs:Class?

  • From: John Cowan <cowan@l...>
  • To: "Roger L. Costello" <costello@m...>
  • Date: Tue, 04 May 1999 10:47:28 -0400

sch ma range cd
Roger L. Costello wrote:

> Okay, now that I've convinced myself that I don't understand the example
> in the RDF Schema spec, let me restate my question:  how did that
> example come up with just those four values for the maritalStatus
> property?  In general, if I create a Class, how do I specify its range
> of values?

That is part of a general unsolved problem having to do with
"How do you know when there are (no) more relevant RDF statements?"
In this case, the example is taking a "closed world" assumption
that says "No instances of MaritalStatus exist except the ones
created in this RDF document."  In other cases, of course, an
"open world" assumption prevails.

Hopefully some mechanism for indicating closure will eventually be
created.

-- 
John Cowan	http://www.ccil.org/~cowan		cowan@c...
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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