Baskaufs created this task. Baskaufs added a project: Wikidata-Query-Service. Restricted Application added a subscriber: Aklapper. Restricted Application added a project: Wikidata.
TASK DESCRIPTION For background, see this issue <https://issues.apache.org/jira/browse/JENA-2005?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel&focusedCommentId=17241743#comment-17241743>. When a statement is written having a value that is a quantity, and that quantity is a whole number, the WD Query Service binds a datatyped literal value like "4"^^xsd:decimal . This is the canonical representation under XML Schema 1. However, under XML Schema 1.1, the canonical representation <https://www.w3.org/TR/xmlschema11-2/#decimal> is now "4.0"^^xsd:decimal . The practical implication of this is that if a federated query to the Wikidata Query Service is made from a service like Apache Jena that supports XML Schema 1.1, variables that are bound to the same whole decimal number locally and on the remote endpoint do not match. I realize that Blazegraph is no longer supported by its developers, so I don't know how difficult it would be to update the handling of whole decimal numbers to XML Schema 1.1 To reproduce, load this triple locally in Jena into the graph http://journals: wd:Q97446840 wdt:P2896 <https://phabricator.wikimedia.org/P2896> 4.0 . Perform the following query prefix wd: http://www.wikidata.org/entity/ prefix wdt: http://www.wikidata.org/prop/direct/ SELECT DISTINCT ?value WHERE { GRAPH <http://journals> { wd:Q97446840 wdt:P2896 ?value. } } The result is "4.0"^^xsd:decimal Now in Jena perform the following federated query: prefix wd: http://www.wikidata.org/entity/ prefix wdt: http://www.wikidata.org/prop/direct/ SELECT DISTINCT ?value WHERE { SERVICE <https://query.wikidata.org/sparql> { wd:Q97446840 wdt:P2896 ?value. } } The response is "4"^^xsd:decimal . If you combine the two queries into a single query and perform a MINUS operation, the two bindings for ?value are not seen as the same. TASK DETAIL https://phabricator.wikimedia.org/T269858 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Baskaufs Cc: Baskaufs, Aklapper, CBogen, Akuckartz, Nandana, Namenlos314, Lahi, Gq86, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, _jensen, rosalieper, Scott_WUaS, Jonas, Xmlizer, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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