revise SHACL JSON-LD context

[VladimirAlexiev]

• JSON-LD examples should use context #468 asks to optimize JSON-LD examples by using an appropriate context

Are there plans to revise https://github.com/w3c/data-shapes/blob/gh-pages/shacl-jsonld-context/shacl.context.ld.json ?

• Trying to compact that example with the above context (https://tinyurl.com/2s3vyvxz on playground) causes:
  jsonld.SyntaxError: Absolute IRI "sh:NodeShape" confused with prefix "sh".
• The context uses "@vocab" and then defines terms without the sh: prefix. But:
  • @vocab has been criticized as too broad/dangerous by no less than Manu Sporny himself
  • My experience with using @vocab in GS1 EPCIS is that it is an over-optimization, i.e. makes it harder to mix-in other vocabularies
  • All JSON-LD examples I have seen use the sh: prefix
• The context should be deployed at a well-known location and served with appropriate MIME type (application/json)

[ajnelson-nist]

Is there a reason the file's extension is .ld.json, and not .jsonld? jsonld is noted in these two locations, and IIRC that is the appropriate extension to use for context dictionaries (though, corrections welcome if I misremembered):

• https://www.iana.org/assignments/media-types/application/ld+json
• https://www.w3.org/TR/json-ld11/#iana-considerations

[ajnelson-nist]

Also, @VladimirAlexiev , is there a reason you suggest the serving MIME type be application/json instead of application/ld+json with the profile http://www.w3.org/ns/json-ld#context?