Re: [Wikidata-tech] query with incomplete result setecho "# DEALERDEALERS5" >> README.md git init git add README.md git commit -m "first commit" git remote add origin https://github.com/DEALERSDEALER/
'+' On Oct 3, 2017 5:17 PM, "Stas Malyshev" wrote: Hi! On 10/3/17 4:49 PM, Marco Neumann wrote: > thank you Lucas and Stas, this works for me. > > so it would be fair to say that p:P39 by-passes the semantics of > wdt:P39 with ranking*. for my own understanding why is a wdt property > called a direct property**? Because wdt: links directly to value, while p: links to a statement (where ps: links to the value). But that's not the only property of wdt: - another property that it links to "truthy" (current, best, etc.) value - one that has best rank in this property (hence the "t" letter). This may be what you want or not, depending on general semantics and your particular case. For many properties, ranks do not play significant role, since these properties do not change with time and do not have temporally limited statements. So for these, using wdt: is always ok. For some, like positions, offices, relationships between humans, etc. the values can have temporal limits and if you want best/current one, you use wdt:, otherwise you use p:/ps:. If you still want to account for rank using p:/ps:, there are rank triples and wikibase:BestRank class (see https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format#Statement_ representation). -- Stas Malyshev smalys...@wikimedia.org ___ Wikidata-tech mailing list Wikidata-tech@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-tech ___ Wikidata-tech mailing list Wikidata-tech@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-tech
Re: [Wikidata-tech] query with incomplete result set
Hi! On 10/3/17 4:49 PM, Marco Neumann wrote: > thank you Lucas and Stas, this works for me. > > so it would be fair to say that p:P39 by-passes the semantics of > wdt:P39 with ranking*. for my own understanding why is a wdt property > called a direct property**? Because wdt: links directly to value, while p: links to a statement (where ps: links to the value). But that's not the only property of wdt: - another property that it links to "truthy" (current, best, etc.) value - one that has best rank in this property (hence the "t" letter). This may be what you want or not, depending on general semantics and your particular case. For many properties, ranks do not play significant role, since these properties do not change with time and do not have temporally limited statements. So for these, using wdt: is always ok. For some, like positions, offices, relationships between humans, etc. the values can have temporal limits and if you want best/current one, you use wdt:, otherwise you use p:/ps:. If you still want to account for rank using p:/ps:, there are rank triples and wikibase:BestRank class (see https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format#Statement_representation). -- Stas Malyshev smalys...@wikimedia.org ___ Wikidata-tech mailing list Wikidata-tech@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-tech
Re: [Wikidata-tech] query with incomplete result set
thank you Lucas and Stas, this works for me. so it would be fair to say that p:P39 by-passes the semantics of wdt:P39 with ranking*. for my own understanding why is a wdt property called a direct property**? * https://www.wikidata.org/wiki/Help:Ranking **https://www.mediawiki.org/wiki/Wikidata_query_service/User_Manual#Basics_-_Understanding_Prefixes On Tue, Oct 3, 2017 at 7:24 PM, Stas Malyshev wrote: > Hi! > > On 10/3/17 4:02 PM, Marco Neumann wrote: >> why doesn't the following query produce >> http://www.wikidata.org/entity/Q17905 in the result set? > > The query asks for wdt:P39 wd:Q1939555, however current preferred value > for P39 there is Q29576752. When the item has preferred value, only this > value shows up in wdt. If you want all values, use something like: > > https://query.wikidata.org/#SELECT%20%3FMdB%20%3FMdBLabel%20WHERE%20%7B%0ASERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%7D%0A%3FMdB%20p%3AP39%20%3FxRefNode.%20%0A%3FxRefNode%20pq%3AP2937%20wd%3AQ30579723%3B%0A%20%20%20ps%3AP39%20wd%3AQ1939555.%0A%7D > > Or change "preferred" status on Q17905:P39. > > -- > Stas Malyshev > smalys...@wikimedia.org -- --- Marco Neumann KONA ___ Wikidata-tech mailing list Wikidata-tech@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-tech
Re: [Wikidata-tech] query with incomplete result set
Hi! On 10/3/17 4:02 PM, Marco Neumann wrote: > why doesn't the following query produce > http://www.wikidata.org/entity/Q17905 in the result set? The query asks for wdt:P39 wd:Q1939555, however current preferred value for P39 there is Q29576752. When the item has preferred value, only this value shows up in wdt. If you want all values, use something like: https://query.wikidata.org/#SELECT%20%3FMdB%20%3FMdBLabel%20WHERE%20%7B%0ASERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%7D%0A%3FMdB%20p%3AP39%20%3FxRefNode.%20%0A%3FxRefNode%20pq%3AP2937%20wd%3AQ30579723%3B%0A%20%20%20ps%3AP39%20wd%3AQ1939555.%0A%7D Or change "preferred" status on Q17905:P39. -- Stas Malyshev smalys...@wikimedia.org ___ Wikidata-tech mailing list Wikidata-tech@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-tech
[Wikidata-tech] query with incomplete result set
why doesn't the following query produce http://www.wikidata.org/entity/Q17905 in the result set? https://query.wikidata.org/#SELECT%20%3FMdB%20%3FMdBLabel%20WHERE%20%7B%0ASERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%7D%0A%3FMdB%20wdt%3AP39%20wd%3AQ1939555%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20p%3AP39%20%3FxRefNode.%20%0A%3FxRefNode%20pq%3AP2937%20wd%3AQ30579723.%0A%7D Thx -- --- Marco Neumann KONA ___ Wikidata-tech mailing list Wikidata-tech@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-tech
