Hi Ettore,
speaking as the person who’s entered the current data into the LOD
Cloud… no, I’m afraid it’s not as easy. Some of our namespaces (i. e.
RDF formatter URLs) are wrong, some of the namespaces in the LOD Cloud
are wrong, some datasets just don’t have a clean namespace (or they have
several of them), some of our properties map to more than one LOD Cloud
dataset, some LOD Cloud datasets map to more than one of our properties,
and in general this is all just a terrible mess.
We might be able to start cleaning up this mess if we create a property
“LOD Cloud identifier” or something like that, but I think if you try to
match datasets between the two databases automatically you’re just
asking for trouble.
Cheers,
Lucas
On 28.07.2018 13:13, Ettore RIZZA wrote:
Dear all,
stop me if my question is naive or stupid. But I see that a dataset
like Europeana is both in the Lod Cloud and as a property in Wikidata
<https://www.wikidata.org/wiki/Property:P727>. However, the method
using the "Formatter URL for RDF resource" property does not work
because this property is missing from Europeana ID. How many other
cases like this?
But I see in this simplified version of the Lod Cloud
<https://jqplay.org/s/bgiJvPKryC> that each dataset has a namespace.
Would not it be more efficient to match Wikidata and Lod Cloud using
this namespaces in a series of Sparql queries
<http://tinyurl.com/y8taazzm>?
Cheers,
Ettore
On Mon, 9 Jul 2018 at 14:07, Lucas Werkmeister
<mail(a)lucaswerkmeister.de <mailto:mail@lucaswerkmeister.de>> wrote:
On 27.06.2018 22:40, Federico Leva (Nemo) wrote:
Maarten Dammers, 27/06/2018 23:26:
> Excellent news!
https://lod-cloud.net/dataset/wikidata seems to
> contain the info in a more human readable (and machine
readable) way.
> If we add some URI link, does it
automagically appear or does Lucas
> has to do some manual work? I assume Lucas has to do some
manual work.
I'd also be curious what to do when a property does not have a
node in
the LOD cloud, for instance P2948 is among the 77
results for P1921
but I don't see any corresponding URL in
http://lod-cloud.net/versions/2018-30-05/lod-data.json
Previously it was manual work, yes, and for properties not in the LOD
cloud I added commented-out entries to the page source of
https://www.wikidata.org/wiki/User:Lucas_Werkmeister_(WMDE)/LOD_Cloud
<https://www.wikidata.org/wiki/User:Lucas_Werkmeister_%28WMDE%29/LOD_Cloud>.
I’ll try to resubmit Wikidata now and see how the submission
process has
evolved.
Cheers, Lucas
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