Hi! On 10/3/17 4:02 PM, Marco Neumann wrote: 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%0AS… Or change "preferred" status on Q17905:P39. -- Stas Malyshev smalyshev(a)wikimedia.org

Hi! On 10/3/17 4:49 PM, Marco Neumann wrote: 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_…). -- Stas Malyshev smalyshev(a)wikimedia.org