media type / content type / MIME type for Croissant (JSON-LD "profile" parameter)

[pdurbin]

tl;dr

Can the Croissant spec be updated to formally state that the media type for Croissant is application/ld+json; profile="http://mlcommons.org/croissant/1.0" (the value from "conformsTo": "http://mlcommons.org/croissant/1.0")?

Long version

During the excellent presentation @stain gave this week on Signposting I learned that JSON-LD allows you use a "profile" parameter to help distinguish between formats that are all "application/ld+json" (such as Croissant, CodeMeta, RO-Crate, etc.).

For example, the RO-Crate docs have a section called RO-Crate JSON-LD Media type that shows the following example (note the use of "profile"):

HEAD http://example.com/ro-123/ro-crate-metadata.json HTTP/1.1
HTTP/1.1 200 OK
Content-Type: application/ld+json; profile="http://www.w3.org/ns/json-ld#flattened http://www.w3.org/ns/json-ld#compacted https://w3id.org/ro/crate"

During the call I asked what I should use for "profile" for Croissant. @benjelloun indicated I should use the value from "conformsTo": "http://mlcommons.org/croissant/1.0" like this:

Content-Type: application/ld+json; profile="http://mlcommons.org/croissant/1.0"

This makes complete sense and I'll try it but it would be nice to see this mentioned specifically in the spec. I'm happy to create a pull request if you like!

For more on the JSON-LD "profile" parameter, here's a screenshot of some docs from https://www.w3.org/TR/json-ld/#application-ld-json