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https://issues.apache.org/jira/browse/JENA-2005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17240462#comment-17240462
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Steve Baskauf commented on JENA-2005:
-------------------------------------
Thanks for clarifying this, Andy. I suppose the problem then is that the
bindings being passed from the remote endpoint are not in canonical form, then.
The Wikidata Query Service is running Blazegraph, which is no longer under
development and may be out of date. I suppose it may not be following XML
Schema 1.1
> SPARQL does not correctly handle xsd:decimal datatypes
> ------------------------------------------------------
>
> Key: JENA-2005
> URL: https://issues.apache.org/jira/browse/JENA-2005
> Project: Apache Jena
> Issue Type: Question
> Components: Fuseki
> Affects Versions: Jena 3.16.0
> Reporter: Steve Baskauf
> Priority: Minor
>
> In performing a federated query at the Wikidata Query Service
> ([https://query.wikidata.org/sparql),] I bound the object of the triple:
>
> <http://www.wikidata.org/entity/Q97446840>
> <http://www.wikidata.org/prop/direct/P2896> "4"^^xsd:decimal.
>
> as it was provided by the SERVICE endpoint. I also bound the value of the
> triple:
>
> <http://www.wikidata.org/entity/Q97446840>
> <http://www.wikidata.org/prop/direct/P2896> "4.0"^^xsd:decimal.
>
> which was present in the local dataset. (The value was originally loaded from
> Turtle as the number 4.0 (not a datatyped literal).
> When I performed a MINUS operation between the bound values from the SERVICE
> endpoint and the bound values from the local triplestore, this value should
> have been removed from the result set because according to the XML schema
> Recommendation [https://www.w3.org/TR/xmlschema-2/#decimal] both "4" and
> "4.0" are valid lexical representations ("If the fractional part is zero, the
> period and following zero(es) can be omitted.") of the same decimal number.
> However, Fuseki did not recognize the two values as identical, which is an
> error.
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