On Wed, Dec 10, 2014 at 5:07 PM, Magnus Knuth <
[email protected]> wrote:
> Just an add-on about what I did not understand.
>
> Asking for the resource of Park Güell in DBpedia I have to use the
> URI-encoded URL:
> curl -L -H "Accept: text/turtle; q=1.0, application/x-turtle; q=0.9,
> text/n3; q=0.8, application/rdf+xml; q=0.5, text/plain; q=0.1"
> http://dbpedia.org/resource/Park_G%C3%BCell
>
> The IRI-encoded URL does not return any result:
> curl -L -H "Accept: text/turtle; q=1.0, application/x-turtle; q=0.9,
> text/n3; q=0.8, application/rdf+xml; q=0.5, text/plain; q=0.1"
> http://dbpedia.org/resource/Park_Güell
>
> Why that, it should at least return the owl:sameAs
> dbpedia:Park_G%C3%BCell, right?
>
> Though for German DBpedia both URLs (IRI and URI) return exactly the same:
> curl -L -H "Accept: text/turtle; q=1.0, application/x-turtle; q=0.9,
> text/n3; q=0.8, application/rdf+xml; q=0.5, text/plain; q=0.1"
> http://de.dbpedia.org/resource/Park_Güell
> curl -L -H "Accept: text/turtle; q=1.0, application/x-turtle; q=0.9,
> text/n3; q=0.8, application/rdf+xml; q=0.5, text/plain; q=0.1"
> http://de.dbpedia.org/resource/Park_G%C3%BCell
The reason for this behavior is the 'dbp_decode_iri' registry value. See
the following links for examples
https://github.com/dbpedia/dbpedia-vad-i18n/blob/master/dbpedia/dbpedia_local.sql#L81
https://github.com/dbpedia/dbpedia-vad-i18n/blob/master/dbpedia/vsp/description.vsp#L215
https://github.com/dbpedia/dbpedia-vad-i18n/blob/master/dbpedia/dbpedia_local.sql#L314
In English this variable is set to false and thus, IRIs are not decoded
properly to get resolved. The idea is that HTTP protocol encodes all
requests to URIs and then the server (vos) is responsible for resolving to
the correct resource to a URI (leaving the request as is) or to an IRI (by
decoding the request). The trick here is that when we enable IRIs we cannot
know if a request was about an IRI or a URI since HTTP converts everything
to URIs, thus both links will work
> Thing is that the German DBpedia points to owl:sameAs dbpedia:Park_Güell
> and most other language chapters do that.
>
> I totally understand the problem of breaking legacy links from external
> datasets. But we should somehow discuss how a transformation can be
> achieved, because as said the problem gets not solved by postponing it year
> after year. We also should consider that quite a bunch of external datasets
> are already broken, due to changes in the URI structures (e.g. usage of
> unescaped comma and brackets) or resources that disappeared over time.
> One solutions could be redirects for dereferencing. But also accessing
> DBpedia via SPARQL should be considered.
>
I also agree that leaving this doesn't solve the problem. I think we should
make the switch in the next release but let's think of the best way to do
it.
> Finally, as I understood now (it is not mentioned on [
> http://wiki.dbpedia.org/DatasetsLoaded2014] properly) the .nt (URI) and
> not the .ttl (IRI) datasets have been imported!?
>
> If you like, we could start a group discussion, collecting all possible
> issues and effects related to that, and looking for viable solutions.
>
> Thanks,
> Magnus
>
> --
> Magnus Knuth
>
> Hasso-Plattner-Institut für Softwaresystemtechnik GmbH
> Prof.-Dr.-Helmert-Str. 2-3
> 14482 Potsdam
>
> Amtsgericht Potsdam, HRB 12184
> Geschäftsführung: Prof. Dr. Christoph Meinel
>
> tel: +49 331 5509 547
> email: [email protected]
> web: http://www.hpi.de/
> webID: http://magnus.13mm.de/
>
>
>
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--
Dimitris Kontokostas
Department of Computer Science, University of Leipzig
Research Group: http://aksw.org
Homepage:http://aksw.org/DimitrisKontokostas
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