W3C home > Mailing lists > Public > public-data-shapes-wg@w3.org > January 2015

Re: shapes and classes: different

From: Eric Prud'hommeaux <eric@w3.org>
Date: Mon, 26 Jan 2015 16:50:01 -0500
To: Irene Polikoff <irene@topquadrant.com>
Cc: Jerven Tjalling Bolleman <jerven.bolleman@isb-sib.ch>, "Peter F. Patel-Schneider" <pfpschneider@gmail.com>, RDF Data Shapes Working Group <public-data-shapes-wg@w3.org>
Message-ID: <20150126214959.GA20097@w3.org>
* Irene Polikoff <irene@topquadrant.com> [2015-01-26 12:24-0500]
> > Your word shape is my word owl:Class.
> 
> +1
> 
> So, the simplest solution is not to have a new thing called Shape.
> 
> Another option may be to use it as a type so that some classes can be of type Shape as well as Class.
> 
> This seems to be unnecessary though as every class is already a shape. At minimum, even if there are no other constraints declared for a class, it says that all instances belonging to it must have a certain type triple. If there is a class :Person, then its instances must have :Person1 a ::Person triple (whether it is asserted or inferred, doesn't matter). A very minimalistic data shape, but still a shape.

What constraints would you put on a reusable class like foaf:Person?


> Irene
> 
> > On Jan 26, 2015, at 11:12 AM, Jerven Tjalling Bolleman <jerven.bolleman@isb-sib.ch> wrote:
> > 
> > I really can't help myself...
> > 
> >> On 26/01/15 15:12, Peter F. Patel-Schneider wrote:
> >> -----BEGIN PGP SIGNED MESSAGE-----
> >> Hash: SHA1
> >> 
> >> The most important aspect of classes is that you state that objects belong
> >> to them.  If you don't state that objects belong to X, X is not a class.
> >> 
> >> The most important aspect of shapes is that you provide conditions stating
> >> precisely when an object belongs to them.   If you don't provide conditions
> >> stating precisely when an object belongs to X, X is not a shape.
> >> 
> >> Having shapes also be classes implies that you state that objects belong to
> >> shapes.  Having classes also be shapes implies that you provide recognition
> >> conditions for classes. Both situations are possible, but both have
> >> consequences.
> > Your word shape is my word owl:Class. Allowing class membership inference from recognition conditions is as normal as class member ship assertion directly in the data. But I am absolutely flabbergasted that I am having this argument with one of the OWL2 editors!
> > 
> > Basically I am reading your response as class membership only inferred is "shape membership". Class membership asserted is not "shape membership". Or paraphrased: Shapes only allows triples with the shape:member predicate (IMO equivalent to rdf:type) to be inferred and not asserted.
> > 
> > 
> >> 
> >> peter
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> >> 
> > 
> > -- 
> > -------------------------------------------------------------------
> > Jerven Bolleman                        Jerven.Bolleman@isb-sib.ch
> > SIB Swiss Institute of Bioinformatics  Tel: +41 (0)22 379 58 85
> > CMU, rue Michel Servet 1               Fax: +41 (0)22 379 58 58
> > 1211 Geneve 4,
> > Switzerland     www.isb-sib.ch - www.uniprot.org
> > Follow us at https://twitter.com/#!/uniprot
> > -------------------------------------------------------------------
> > 

-- 
-ericP

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Received on Monday, 26 January 2015 21:50:08 UTC

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