Sorry, all the mails were lost in the mare magnum of my full inbox, and I forgot to thank you all for your answers. :)
L. 2015-04-30 12:07 GMT+02:00 Markus Krötzsch <mar...@semantic-mediawiki.org>: > On 30.04.2015 11:25, Jean-Baptiste Pressac wrote: >> >> Hello, >> Does this also means that the RDF data available via for instance >> http://www.wikidata.org/entity/Q235382.nt or >> http://www.wikidata.org/entity/Q235382 could not be queried via SPARQL >> unless you download the .nt file and use for instance Jena ARQ >> <https://jena.apache.org/documentation/query/index.html> on your own >> computer ? > > > Maybe not your computer, but somebody has to download the data in some way > in order for it to be queried. Query answering is a complicated process that > does not usually work on the fly, and somebody has to do the math in the > end. There are some approaches to explore linked data in a query-like manner > in real time, but it should be clear that this will always take much longer > than if you have downloaded the data first. > >> >> Does this also means that there is no use to publish RDF data linking to >> Wikidata like for instance : >> >> @prefix mydata: <http://mydata.fr/> . >> @prefix cidoc: <http://www.cidoc-crm.org/cidoc-crm/> . >> @prefix wikidata: <http://www.wikidata.org/entity/> >> >> mydata:event/1 a cidoc:E67_Birth ; >> cidoc:P98_brought_into_life mydata:person/80 ; >> cidoc:P7_took_place_at wikidata:Q235382 ; > > > This is still a useful thing to do for several reasons. First of all, the > link connects your data and clarifies its meaning. This is useful to > consumers who find your data. Second, there are linked data crawlers that > aggregate linked data from many sources to provide you with a query service. > OpenLink is running one such service, and if they managed to find your data, > you could use their service to issue queries. > > Regards, > > Markus > > >> >> Thanks, >> >> >> Jean-Baptiste Pressac >> >> Traitement et analyse de bases de données >> Production et diffusion de corpus numériques >> >> Centre de Recherche Bretonne et Celtique >> Unité mixte de service (UMS) 3554 >> 20 rue Duquesne >> CS 93837 >> 29238 Brest cedex 3 >> >> tel : +33 (0)2 98 01 68 95 >> fax : +33 (0)2 98 01 63 93 >> >> Le 29/04/2015 21:44, Markus Krötzsch a écrit : >>> >>> On 29.04.2015 20:56, Luca Martinelli wrote: >>>> >>>> Dear all, >>>> >>>> I need to know about the possibility of making queries on a Wikibase >>>> instance. I think it is possible to make queries on data on a >>>> particular instance only with external tools at the moment, right? >>> >>> >>> Yes, this is correct. The SPARQL query support that we currently offer >>> is obtained by making an RDF export and loading it into a SPARQL >>> database (we use Virtuoso but you could also use BlazeGraph, for >>> example; both have free and open source versions and are not hard to >>> install overall; if your data is not so large, you could also try >>> Jena; there are further open source RDF databases, but these are the >>> most prominent right now I think). >>> >>> The RDF export, too, is not currently generated by Wikibase. However, >>> Wikidata Toolkit, which we use to make the RDF dumps, can be used with >>> data from any Wikibase installation in theory. In practice, nobody has >>> asked for this yet and we might have to make a few adjustments to >>> really get it to work in a convenient way. For a start, I don't know >>> what kind of export options a standalone Wikibase offers you at the >>> moment. We can use the usual XML-based page dump if it contains valid >>> JSON for a change (this was not the case for Wikidata last time I >>> checked ...). Better yet would be the JSON exports, but I don't know >>> if you can generate them with vanilla Wikibase or if WMF is using some >>> special tools for this. >>> >>> Anyway, it can't be too hard to make this work and once it is done you >>> would have a query service that is at the same level as the one of >>> Wikidata. You could even combine data from more than one Wiki in one >>> RDF database, e.g., to run queries over data from both. >>> >>> Regards, >>> >>> Markus >>> >>> >>> _______________________________________________ >>> Wikidata-l mailing list >>> Wikidata-l@lists.wikimedia.org >>> https://lists.wikimedia.org/mailman/listinfo/wikidata-l >> >> >> >> >> _______________________________________________ >> Wikidata-l mailing list >> Wikidata-l@lists.wikimedia.org >> https://lists.wikimedia.org/mailman/listinfo/wikidata-l >> > > > _______________________________________________ > Wikidata-l mailing list > Wikidata-l@lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/wikidata-l -- Luca "Sannita" Martinelli http://it.wikipedia.org/wiki/Utente:Sannita _______________________________________________ Wikidata-l mailing list Wikidata-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l
