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https://issues.apache.org/jira/browse/JENA-1679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne reassigned JENA-1679:
-----------------------------------
Assignee: Andy Seaborne
> Effective boolean value for "NaN"^^xsd:float/xsd:double should be false
> -----------------------------------------------------------------------
>
> Key: JENA-1679
> URL: https://issues.apache.org/jira/browse/JENA-1679
> Project: Apache Jena
> Issue Type: Bug
> Environment: Tested on Jena 3.9
> Reporter: Richard Cyganiak
> Assignee: Andy Seaborne
> Priority: Major
>
> SPARQL 1.1 defines the [effective boolean
> value|https://www.w3.org/TR/sparql11-query/#ebv
> ] (EBV) of the special numeric value NaN as follows:
> {quote}
> If the argument is a numeric type or a typed literal with a datatype derived
> from a numeric type, and it has a valid lexical form, the EBV is false if the
> operand value is NaN or is numerically equal to zero; otherwise the EBV is
> true.
> {quote}
> Jena however treats it as {{true}}. The following queries both return
> {{true}} but should return {{false}} (using {{!(!expr))}} to get the EBV):
> {noformat}
> SELECT (!(!"NaN"^^<http://www.w3.org/2001/XMLSchema#double>) AS ?x) WHERE {}
> SELECT (!(!"NaN"^^<http://www.w3.org/2001/XMLSchema#float>) AS ?x) WHERE {}
> {noformat}
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