- From: Jeff Heflin <heflin@cse.lehigh.edu>
- Date: Mon, 17 Mar 2003 09:46:44 -0500
- To: Peter Crowther <Peter.Crowther@networkinference.com>
- CC: pat hayes <phayes@ai.uwf.edu>, www-webont-wg@w3.org
I'm not sure if Ian's proposal rules out the possibility of saying "more than 1," but if so, I can think of a number of examples of these: - the class of all people with more than one middle name - the class of people with more than one alias - the class of products with more than one advertised price Specific numbers are a little harder. Maybe saying something like a triangle has exactly three values for its angle property? You could probably come up with a number of examples like this for CAD or geo-spatial database applications. Jeff Peter Crowther wrote: > > > From: pat hayes [mailto:phayes@ai.uwf.edu] > > > > >"people who have at least three values for property x." > > > > > >where x is a data valued property. I, too, struggle to think > > of an example > > >where one would actually want to use such a construct (but am open to > > >suggestion).... > > > > People who own three or more homes, people with at least three > > sources of income, people with at least three children, people with > > with at least three nationalities, people who have travelled to more > > than three foreign nations during the last six months,.... > > All good examples of cardinality contraints to objects; I have to say > that I'm not convinced that any of the following are naturally > datatypes: > > - homes > - sources of income > - children > - nationalities > - travel to a given nation during a date range > > Nationality, in my view, comes closest; but why is this better as a > datatype than an object? > > - Peter
Received on Monday, 17 March 2003 09:47:02 UTC