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RE: Reflexivity and antisymmetry uses cases?

From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk>
Date: Tue, 9 Jan 2007 13:22:41 -0000
Message-ID: <4AA808D68343824E8891632BD448AE6B04A26FCC@OSMAIL.ordsvy.gov.uk>
To: "Holger Knublauch" <holger@topquadrant.com>, <public-owl-dev@w3.org>

> we are looking into the user interface requirements that will 
> be needed to support OWL 1.1. Toward this end, we are 
> interested in understanding the use cases in support of the 
> various new features of OWL 1.1.  I can easily make sense of 
> user-defined datatypes and QCRs, but I don't think I had seen 
> a lot of examples for some of the other proposed features so 
> far (except for toy ontologies):
>   - owl:SelfRestriction
>   - owl:IrreflexiveProperty
>   - owl:AntiSymmetricProperty
> If you know of a published list of use cases (either formal 
> or informal), or if you have your own use case for any of 
> these features, I would be interested in seeing them.


It is argued that reflexivity is required when modelling mereology. See


I think these properties of OWL 1.1 could certainly have applications in
the geospatial domain. For example we might want to say that all rivers
flow into rivers, seas or lakes but they cannot flow into themselves. I
guess we could do this as follows:

River -> flowsInto some (River or Sea or Lake) and not flowsInto Self

Many topological relationships (for example those of RCC8) would be
irreflexive and antisymmetric. 

These properties might also be useful in modelling topology with some
notion of orientation. Properties such as "northOf", "eastOf", "leftOf",
"above" etc. would be antisymmetric and antisymmetric. 

As we experiment more with OWL1.1 I can probably come up with more


Dr John Goodwin
Research Scientist
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Received on Tuesday, 9 January 2007 13:26:20 UTC

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