W3C home > Mailing lists > Public > semantic-web@w3.org > July 2014

two questions about VoID

From: Armando Stellato <stellato@info.uniroma2.it>
Date: Fri, 4 Jul 2014 11:52:31 +0200
Message-ID: <DUB408-EAS36875575D1D2D0E880C5F2BA0000@phx.gbl>
To: <public-lod@w3.org>, "'semantic-web'" <semantic-web@w3.org>
Dear all,


In the context of the ontolex working group
(http://www.w3.org/community/ontolex/), we are providing a lexical metadata
vocabulary extending the void vocabulary.


So, two questions, in order to correctly extend (and use) void:


1) Class extension for void:Dataset


I would like to get confirmed is if the definition of void:Dataset is
including owl vocabularies. The definition of void:Dataset
(http://www.w3.org/TR/void/#dataset ) states:


The fundamental concept of VoID is the dataset. A dataset is a set of RDF
triples that are published, maintained or aggregated by a single provider.


In principle, it could include the notion of OWL ontology (a set of
published RDF triples) though it is not totally clear from the full
description. Also, in all the document, they talk about sparqlendpoint, http
dereferenciation (ok, it works implicitly for ontologies) and dumps. That
is, not a mention is done about cases for ontology vocabularies.


One other hint comes from the definition of the void:vocabulary property.
Nothing formal here too in one sense or the other, but here it seems to hint
at the fact that these are distinct entities. Actually, not strictly, as an
owl:Ontology (as a Dataset) could be using the classes and properties of
another owl:Ontology


 <http://rdfs.org/ns/void#vocabulary> void:vocabulary

A vocabulary or owl:Ontology whose classes or properties are used in a

 <http://www.w3.org/TR/void/#vocabularies> Section 4.3


One last hint is given by the VOAF vocabulary (
<http://purl.org/vocommons/voaf> http://purl.org/vocommons/voaf), where they
define voaf:Vocabulary (http://purl.org/vocommons/voaf#Vocabulary) as a
subclass of void:Dataset, though in any case, it is just an interpretation
of void given by another vocabulary author.


So, what should I assume?


2) Error in void:subset example on the void specs?


All examples in the void specifications (http://www.w3.org/TR/void/), and
the definition in section 8 (http://www.w3.org/TR/void/#cheatsheet ) seem to
suggest the structure of a triple for this property is:


dataset                 void:subset        subset_of_dataset


.but in section 5.2 (http://www.w3.org/TR/void/#linkset-subset ) it is being
used in the opposite way:


:DBpedia_Geonames a void:Linkset;

    void:target :DBpedia;

    void:target :Geonames;

    void:subset :DBpedia;

    void:triples 252000;



Can anyone confirm if it is the use in 5.2 being wrong?


Thanks for any help,



Received on Friday, 4 July 2014 09:52:52 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 1 March 2016 07:42:52 UTC