ericP added a comment.
The RDF model asserts that a literal with a langtag is considered to have a
datatype of `rdf:langString`. The various formats state exactly how literals
with langtags are written. The former specifies how APIs behave, such as a
SPARQL FILTER ```DATATYPE("ab"@es) = rdf:langTag```; the latter specifies how
they are written. The rules for the XML and JSON results formats are that the
implicit datatype of langtagged literals is omitted.
I can see how this is confusing but I believe the community doesn't see them
as conflicting. Also, sadly, it seems that these are covered for the XML
results format (look for `xml:lang` in the results for strlang03
<https://www.w3.org/2009/sparql/docs/tests/summary.html#functions-strlang03>,
but not for JSON.
TASK DETAIL
https://phabricator.wikimedia.org/T225996
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To: ericP
Cc: ericP, Smalyshev, Lucas_Werkmeister_WMDE, Fnielsen, Aklapper,
darthmon_wmde, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, EBjune, merbst,
LawExplorer, _jensen, rosalieper, Cirdan, Jonas, Xmlizer, jkroll,
Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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