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Re: shapes-ISSUE-30 (shape-and-data-graphs): Are shapes and data in the same graph? [SHACL Spec]

From: Richard Cyganiak <richard@cyganiak.de>
Date: Sat, 28 Mar 2015 21:59:35 +0000
Cc: "public-data-shapes-wg@w3.org" <public-data-shapes-wg@w3.org>
Message-Id: <8B10269F-6591-4EB0-917B-F0F03E4408AC@cyganiak.de>
To: "Peter F. Patel-Schneider" <pfpschneider@gmail.com>

> On 28 Mar 2015, at 20:31, Peter F. Patel-Schneider <pfpschneider@gmail.com> wrote:
> Hash: SHA1
> I am uncertain as to what access to the shape graph when validating the data
> graph is supposed to mean.
> On one hand, it seems to me that if the shape graph is inaccessible then
> there is no way that the shapes can be acccessed and so no way to validate
> the shapes, so it appears to me that all proposals need this.  On the other
> hand, I am unaware that any proposal needs the shape graph to be part of the
> data graph.

The treatment of sh:allowedValues in the SHACL draft [1][2] requires that shapes and data be in the same graph, as it relies on querying the sh:member triples.

An alternative would be to pass the allowed values in as pre-bound variables, as done for other constructs. But there is the complication that it’s more than one.

Another alternative would be to do something with RDF datasets.


[1] https://w3c.github.io/data-shapes/shacl/#AbstractAllowedValuesPropertyConstraint
[2] https://w3c.github.io/data-shapes/shacl/#sparql-AbstractAllowedValuesPropertyConstraint

> peter
> On 03/28/2015 01:21 PM, RDF Data Shapes Working Group Issue Tracker wrote:
>> shapes-ISSUE-30 (shape-and-data-graphs): Are shapes and data in the same
>> graph? [SHACL Spec]
>> http://www.w3.org/2014/data-shapes/track/issues/30
>> Raised by: Richard Cyganiak On product: SHACL Spec
>> Some proposals assume that the data to be validated, and the RDF graph
>> encoding the shapes, are in separate graphs. Others assume they are in
>> the same graph, and rely on being able to access triples from the shape
>> graph when validating the data graph.
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Received on Saturday, 28 March 2015 22:00:00 UTC

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