canonical extentions for hextuples

[aucampia]

It would be nice to have some canonical extensions for hextuples, some options:

• .hext
• .ht.ndjson

[joepio]

I like .hext! But that will mean that most applications will not recognize it, and won't do any form of syntax highlighting. And .ndjson (or .ht.ndjson will sometimes work, although .ndjson is still uncommon.

Ideally, we'd also register a MIME type (and the file extension) at IANA for hextuples. I've tried that once before (with JSON-AD) but it was quite a bothersome process, so I never completed it.

@rescribet what do you think?

[rescribet]

We use .hndjson in our systems (hextuple-newline-delimited-json, pronounced handy-json).

[aucampia]

I used .hext in rdflib tests: https://github.com/RDFLib/rdflib/tree/master/test/variants - but outside of tests there is no extension associated with it