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Re: Proposed simplification of datatype expressions

From: Jeff Heflin <heflin@cse.lehigh.edu>
Date: Mon, 17 Mar 2003 09:46:44 -0500
Message-ID: <3E75DFD4.9550E3F7@cse.lehigh.edu>
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.


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

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