MicrobeBot created this task. MicrobeBot added a subscriber: MicrobeBot. MicrobeBot added a project: Wikidata-Query-Service. Herald added a subscriber: Aklapper. Herald added projects: Wikidata, Discovery.
TASK DESCRIPTION SPARQL queries searching for items added months ago fail to locate the item. For example the disease item https://www.wikidata.org/wiki/Q18975220 has the statement P486 (MeSH ID) with string value "D004927". Executing the following SPARQL query searching for the item with statement P486 and value "D004927" returns nothing. https://query.wikidata.org/#PREFIX%20wd%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fentity%2F%3E%20%0APREFIX%20wdt%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fdirect%2F%3E%0A%0ASELECT%20*%20WHERE%20%7B%0A%20%20%3Fdisease%20wdt%3AP486%20%20%22D004927%22%20.%0A%20%20%0A%7D. If you execute the following query (searching for all items with MeSH IDs, 4652 results come back and the above item is not in that list. https://query.wikidata.org/#PREFIX%20wd%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fentity%2F%3E%20%0APREFIX%20wdt%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fdirect%2F%3E%0A%0ASELECT%20*%20WHERE%20%7B%0A%20%20%3Fdisease%20wdt%3AP486%20%20%3Fitem%20.%0A%20%20%0A%7D If you then take an MeSH ID value from that list and query for that, it is returned as follows: https://query.wikidata.org/#PREFIX%20wd%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fentity%2F%3E%20%0APREFIX%20wdt%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fdirect%2F%3E%0A%0ASELECT%20*%20WHERE%20%7B%0A%20%20%3Fdisease%20wdt%3AP486%20%20%22D003093%22%20.%0A%20%20%0A%7D This would indicate that the above item https://www.wikidata.org/wiki/Q18975220 is not in the SPARQL endpoint, however it is possible to query for it when searching for a Wikidata Item datatype like so: https://query.wikidata.org/#PREFIX%20wd%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fentity%2F%3E%20%0APREFIX%20wdt%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fdirect%2F%3E%0A%0ASELECT%20*%20WHERE%20%7B%0A%20%20%3Fdisease%20wdt%3AP828%20%20%20wd%3AQ21102933%20%20.%0A%20%20%0A%7D Summary: The item is only found when querying for WD Item datatype claims. String datatype property claims are not queryable for this item, even though these claims have been on there since before August 2015. Known scope of the issue: Using the backlink api feature I returned all items that link to page Property:P486 and after parsing out user pages there were 5006 items with MeSH IDs (P486). As mentioned above the SPARQL query only returns 4652 results indicating almost 400 items are missing from the endpoint when searching by string datatype properties. This is a very high priority for our Project Molecular Biology Bots because they identify items based on external identifiers. TASK DETAIL https://phabricator.wikimedia.org/T125558 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: MicrobeBot Cc: MicrobeBot, Aklapper, debt, Izno, jkroll, Smalyshev, Wikidata-bugs, Jdouglas, aude, Deskana, Manybubbles, Mbch331 _______________________________________________ Wikidata-bugs mailing list Wikidata-bugs@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-bugs
