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https://issues.apache.org/jira/browse/JENA-2005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17240372#comment-17240372
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Andy Seaborne edited comment on JENA-2005 at 11/29/20, 9:44 PM:
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Matching triple patterns is by RDF term - not by value.
{{"4"^^xsd:decimal}} does not match {{"4.0"^^xsd:decimal}} by triple matching
(it would under D-entailment but not normal triple matching).
The usual approach is represent decimals in canonical form and the Jena parsers
provide this with
{noformat}
RDFParser.create().canonicalValues(true).source(...).parse(...);
{noformat}
of put a FILTER in the MINUS because comparison by "=" is value sensitive (and
not by "seameTerm").
Note: The canonical representation of a decimal changed between XML Schema 1
and 1.1:
[https://www.w3.org/TR/xmlschema11-2/#decimal]
It is now "4.0".
was (Author: andy.seaborne):
Matching triple patterns is by RDF term - not by value.
{{"4"^^xsd:decimal}} does not match {{"4.0"^^xsd:decimal}} (it would under
D-entailment but not normal triple matching).
The usual approach is represent decimals in canonical form and the Jena parsers
provide this with
{noformat}
RDFParser.create().canonicalValues(true).source(...).parse(...);
{noformat}
of put a FILTER in the MINUS because comparison by "=" is value sensitive (and
not by "seameTerm").
Note: The canonical representation of a decimal changed between XML Schema 1
and 1.1:
https://www.w3.org/TR/xmlschema11-2/#decimal
It is now "4.0".
> 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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