Andy Seaborne created JENA-828:
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Summary: 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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