# Re: question on primer example

From: Sebastian Rudolph <rudolph@kit.edu>
Date: Wed, 3 Oct 2012 12:01:21 +0200

Message-Id: <10BCB631-7317-4E6D-B5B9-50B23212785E@kit.edu>
To: "Polleres, Axel" <axel.polleres@siemens.com>
Hi Axel,

it might be better to refer to the current version of the primer, i.e. http://www.w3.org/TR/2009/REC-owl2-primer-20091027/
If you take the mentioned snippet per se, you are right, it allows for persons having more than one age. However if you also specify the axiom

FunctionalDataProperty( :hasAge )

it defines :hasAge to be functional and hence allows only one age per individual. If you assume this axiom, then the definition of Teenager via "some" is perfectly fine.
As far as your suggestion to use "all" instead of "some" is concerned, this would not convey the intended semantics since then all individuals which are *not* in a hasAge relation to any value would be classified as teenagers (mind the somewhat unintuitive interpretation of the "all").

Best,
Sebastian

Am 03.10.2012 um 09:19 schrieb Polleres, Axel:

> Hi,
>
> I have some question on the primer example on DataRanges, cf. http://www.w3.org/TR/2008/WD-owl2-primer-20080411/#Adatarange
>
> The prose text says
> "For example, we might have Teenager as those people whose age is an integer that is at least 13 but less than 20, Adult as those people whose age is at least 21, and Child as those people whose age is in the complement of adult ages."
>
> Class: Teenager EquivalentClass: Person and hasAge some integer[>= 13 , < 20]
> Class: Adult EquivalentClass: Person and hasAge some integer[>= 21]
> Class: Child EquivalentClass: Person and not ( hasAge some integer[>= 21] )
>
> As it stands, this seems to allow several ages per person - one of which is in the defined range.
> IMO, it would be more intuitive to use for the first two lines "all" instead of "some" here plus stating that age is functional (each person has exactly one age, wouldn't it?
>
> Not a big deal nor meant as a formal comment, but just to note and ask for some opinion from the group or explanation why you got to formulate the example like that.
>
> With best regards,
> Axel Polleres
>
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_________________________________________________
PD Dr. Sebastian Rudolph
senior researcher & project leader at AIFB
Karlsruhe Institute of Technology (KIT)
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www.sebastian-rudolph.de        fax +49 721 608 - 45998
Received on Wednesday, 3 October 2012 10:01:53 UTC

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