[ckan-discuss] Not the right SPARQL end point?

Richard Cyganiak richard at cyganiak.de
Mon Sep 27 20:36:16 BST 2010

On 27 Sep 2010, at 20:04, Christophe Gueret wrote:
> Done: http://www.ckan.net/package/linked-open-commerce
> There are currently few information, essentially the only things I  
> got from [2].
> I will see if it's possible to get more information from the authors  
> of the data set.

That's a great start! Thanks a lot Christophe!

> But there is something surprising about the endpoint mentioned in  
> [2]: if you ask for the first, say, 200 triples you get the sames as  
> on the LOD cache end point. As it happens, http://lod.openlinksw.com/sparql 
>  and http://linkedopencommerce.com/sparql both resolve to the same  
> IP...
> This is likely not to be helpful to someone willing to discover what  
> this LOC data set has to offer, a query fetching a sample of the  
> triples will return surprising results for a data set about e- 
> commerce!

Well I hear what you are saying, but we (with CKAN contributor hats  
on) can't do anything about this, except document it.

- add a comment explaining your experience with the dataset
- rate the package
- add a note to the description (which I just did)

Beyond that, you'll have to talk to the publisher of the dataset ...

> It would be better to have an end point that serves only the data  
> announced, or at least the indication of a named graph to use.   
> Assuming it is possible to do so, is there a best-practice around  
> indicating a named graph along with the address of the SPARQL end  
> point?

Add a custom extra field (not resource link, because it's not  
downloadable) called "sparql_graph_name", and provide the graph URI as  
its value. See [1].


[1] http://esw.w3.org/TaskForces/CommunityProjects/LinkingOpenData/DataSets/CKANmetainformation

> Cheers,
> Christophe
>> [1] http://lod.openlinksw.com/
>> [2] http://linkedopencommerce.com/
>> [3] http://esw.w3.org/TaskForces/CommunityProjects/LinkingOpenData/DataSets/CKANmetainformation
>> On 27 Sep 2010, at 14:55, Christophe Guéret wrote:
>>> Dear CKANers,
>>> The "linked-open-commerce" package [1] has "http://lod.openlinksw.com/sparql 
>>> " as its SPARQL end point.
>>> I think that's a bit weird as this SPARQL end point, which -  
>>> unless I'm mistaken - mirrors LOD data, is not aimed at providing  
>>> that specific data set. If its suitable to provide LOD as a  
>>> suitable end point for this data set, then it should also be added  
>>> to many others. That could be interesting as a way to mention  
>>> alternate end points but I think for now it's just misleading. Or  
>>> maybe it's the title & the description of the package if the goal  
>>> was to reference the LOD end point...
>>> Shall the end point be removed from this package or its name/ 
>>> description be fixed?
>>> Cheers,
>>> Christophe
>>> [1] http://www.ckan.net/package/linked-open-commerce
>>> -- 
>>> Dr. Christophe Guéret (cgueret at few.vu.nl)
>>> http://cgueret.net
>>> Postdoc working on SOKS (http://www.few.vu.nl/soks)
>>> Knowledge Representation&  Reasoning Group
>>> Computational Intelligence Group
>>> Department of Computer Science, AI
>>> VU University Amsterdam
>>> <cgueret.vcf>_______________________________________________
>>> ckan-discuss mailing list
>>> ckan-discuss at lists.okfn.org
>>> http://lists.okfn.org/mailman/listinfo/ckan-discuss

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