Github user afs commented on a diff in the pull request: https://github.com/apache/jena/pull/320#discussion_r154326766 --- Diff: jena-text/src/main/java/org/apache/jena/query/text/TextQueryPF.java --- @@ -347,11 +352,15 @@ private StrMatch objectToStruct(PropFuncArg argObject, boolean executionTime) { log.warn("Text query string is not a literal " + list) ; return null ; } - - if (x.getLiteralDatatype() != null && !x.getLiteralDatatype().equals(XSDDatatype.XSDstring)) { --- End diff -- Comment: In RDF 1.1, the data type of a literal is never null. There are functions like `Util.isLangString` (in RDF 1.1: rdf:langString) and `Util.isSimpleString` (in RDF 1.1, xsd:string) that mask the RDF1.0/RDF 1.1 mode setting (not that Jena claims to support RDF 1.0 any more).
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