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https://issues.apache.org/jira/browse/JENA-828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14245991#comment-14245991
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ASF subversion and git services commented on JENA-828:
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Commit 932528b1ebb2cfb93dbc9046b179c6993743fc80 in jena's branch
refs/heads/master from [~andy.seaborne]
[ https://git-wip-us.apache.org/repos/asf?p=jena.git;h=932528b ]
JENA-828 : Sorting of literals for RDF 1.1
> Handling strings for RDF 1.1 in SPARQL
> --------------------------------------
>
> Key: JENA-828
> URL: https://issues.apache.org/jira/browse/JENA-828
> Project: Apache Jena
> Issue Type: Task
> Components: ARQ
> Affects Versions: Jena 2.12.1
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
>
> RDF 1.1 defines simple literals and simple literals to be the same (literals
> with datatype xsd:string). This affects the sorting, where the SPARQL 1.1
> spec says simple literals sort before datatype literals.
> Best compatibility is to make sorting: xsd:string < all other datatypes with
> same lexical form.
> ARQ also defines ordering between any two RDF terms in a stable, predictable
> way based on lexical form first, then simple literals < lang literals <
> datatypes by URI. This is not covered by the SPARQL spec
> For RDF 1.1 this becomes
> # Order by lexical form
> # Order by xsd:string < language literals.
> # Order by language literals, base don language tag (case-insensitive, then
> case senstive).
> # Datatypes by URI string
> A language literal has datatype rdf:langStirng but also has a non-empty
> language tag.
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