Hi Markus, would you recommend to add some sort of "patch" until the new dumps are out, either in the data (by adding some triples to a temporary graph) or just in the Web interface for the external links?
Cheers, Nicola (wikisparql.org) Il 08/04/2015 14:49, Markus Krötzsch ha scritto: > Hi Jean-Baptiste, > > Your observation is correct. This is because a single Wikidata statement > (with one Wikidata property) does not translate into a single triple > (with one RDF property) in RDF. Rather, several RDF triples are used, > they need to use more than one property, and these properties have > different declarations (e.g., some are DatatypeProperties and some are > ObjectProperties). Therefore, we create property variants, currently by > appending letters like "s". > > The current RDF encoding is documented in our ISWC 2014 paper: > https://ddll.inf.tu-dresden.de/web/Inproceedings4005/en > > You are still right that there is a problem here in that you cannot get > from "P123s" to "P123" in the current RDF. This is being worked on: > https://github.com/Wikidata/Wikidata-Toolkit/issues/84 > The dumps will hopefully have this soon. > > Regards, > > Markus > > On 08.04.2015 12:05, Jean-Baptiste Pressac wrote: >> Hello, >> Thank you for this initiative. >> >> However, there is a little problem with the Properties on the result >> pages. For instance on the result page of this query >> http://wikisparql.org/sparql?query=DESCRIBE+%3Chttp%3A//www.wikidata.org/entity/Q18335803%3E >> >> all Wikidata properties have an extra letter after the property ID, for >> instance P463 <https://www.wikidata.org/wiki/Property:P463> has an extra >> "s" (P463s) so that the link to this property (on the arrow icon) leads >> to a bad request page. >> >> A click on this link : http://www.wikidata.org/entity/P463s >> >> >> Brings you on this page rather than http://www.wikidata.org/entity/P463. >> >> >> >> There is also a problem with the link to the wikidata ontology on this >> page >> http://wikisparql.org/sparql?query=DESCRIBE+%3Chttp%3A//www.wikidata.org/entity/VTe085defe2fad71c9445145ec538e724c%3E. >> >> For instance time precision has a link to >> http://www.wikidata.org/ontology#timePrecision which does not exists. >> >> >> >> >> Cheers, >> >> 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 23/03/2015 12:51, Marco Fossati a écrit : >>> Hi everyone, >>> >>> I'd just like to announce another experimental Wikidata SPARQL >>> endpoint [1], kindly provided by the folks at SpazioDati [2]. >>> >>> It contains both the simplified and the complete dumps, as per [3]. >>> Each dump file is stored under a different named graph. >>> We are collecting the query logs, and will share the most frequent >>> queries. >>> >>> Cheers! >>> >>> [1] http://wikisparql.org/ >>> [2] http://spaziodati.eu/en/ >>> [3] http://tools.wmflabs.org/wikidata-exports/rdf/exports/20150223/ >>> >>> On 3/21/15 1:00 PM, [email protected] wrote: >>>> On 3/20/15 2:08 PM, Markus Kroetzsch wrote: >>>>> >Dear all, >>>>> > >>>>> >Thanks to the people at the Center of Semantic Web Research in Chile >>>>> >[1], we have a very first public SPARQL endpoint for Wikidata running. >>>>> >This is very preliminary, so do not rely on it in applications and >>>>> >expect things to fail, but you may still enjoy some things. >>>>> > >>>>> >http://milenio.dcc.uchile.cl/sparql >>>> You have a SPARQL that provides access to Wikidata dumps loaded into an >>>> RDF compliant RDBMS (in this case a Virtuoso RDBMS instance). I >>>> emphasis >>>> "a" because "the first" isn't accurate. >>>> >>>> There are other endpoints that provide access to Wikidata dumps: >>>> >>>> [1]http://lod.openlinksw.com/sparql -- 61 Billion+ RDF triples culled >>>> from across the LOD Cloud (if you lookup Wikidata URIs that are objects >>>> of owl:sameAs relations you'll end up in Wikidata own Linked Data >>>> Space) >>>> >>>> [2]http://wikidata.metaphacts.com/sparql -- another endpoint I >>>> discovered yesterday . >>> >> >> >> >> _______________________________________________ >> Wikidata-l mailing list >> [email protected] >> https://lists.wikimedia.org/mailman/listinfo/wikidata-l >> > > > _______________________________________________ > Wikidata-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikidata-l _______________________________________________ Wikidata-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikidata-l
