Github user hartig commented on the issue:
https://github.com/apache/jena/pull/473
> When Jena 3.9.0 is completed, I can come back and look at this PR. In
principle, there is no reason not have have them extensible.
Sounds good. Thanks!
> What syntax are you using for TSV extensions?
My idea was to simply extend the TSV format that you have in Jena with a
possibility to also represent `Node_Triple` objects (as solution mappings in
SPARQL* may map variables not only to URIs, literals, and bnodes, but also to
triples).
> On the question of mapping `ResultsFormat.FMT_TEXT`: IIRC it is because
text is only an output format and not an input format (but then CSV is also
only an output format).
I see. If you are hesitant to add `ResultsFormat.FMT_TEXT` to
`mapResultsFormatToLang` directly in the Jena code base, my alternative
proposal of introducing a method for adding something to
`mapResultsFormatToLang` from external code (like mine) would work for me too.
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