[ckan-dev] VoiD metadata at http://semantic.ckan.net/sparql

[Cristina Sarasua]

Hi,

I would like to ask something about the VoiD descriptions that can be 
found querying the Data Hub SPARQL endpoint 
<http://semantic.ckan.net/sparql>.

I queried the current endpoint and I saw that the VoiD metadata of a 
data set can be found looking at triples like:

<http://linkeddata.openlinksw.com:80/about/id/entity/http/datahub.io/dataset/data-gov-ie> 
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> 
<http://www.w3.org/ns/dcat#Dataset> .

<http://linkeddata.openlinksw.com:80/about/id/entity/http/datahub.io/dataset/data-gov-ie> 
<http://www.w3.org/ns/dcat#distribution> <http://data-gov.ie/void.ttl> .

taking into account that the value of a dcat:distribution property can 
be any "accessible form of a dataset" as defined by the DCAT vocabulary 
<http://www.w3.org/TR/vocab-dcat/>, and therefore, it can represent the 
SPARQL endpoint, the RDF dump or the VoiD file of a data set, among 
other things. And, in some cases, the rdf:Resource used for specifying 
the location of the VoiD description is not a VoiD .ttl file, but a 
directory instead.

So, if I want to query the "VoiD metadata space" using the Data Hub 
endpoint, in order to find the data sets that satisfy a particular 
requirement, I can parse the VoiD metadata that I find as described, and 
then execute queries over the collected metadata.

I saw that in February there was a thread 
<http://lists.okfn.org/pipermail/ckan-dev/2013-February/003980.html> 
about VoiD at CKAN, where some external resources were mentioned. Is 
what I described, currently the best way to access VoiD information at 
the Data Hub, or should I consider something else?

Thanks in advance.

Kind regards,

Cristina






-- 
Cristina Sarasua

Institute for Web Science and Technologies (WeST)

Universität Koblenz-Landau
Universitätsstraße 1
56070 Koblenz
Germany

e:csarasua at uni-koblenz.de
p: +49 261 287 2772
f: +49 261 287 100 2772
w:http://west.uni-koblenz.de  



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