Support all JSON-LD output variants

[multimeric]

For example, it currently doesn't seem possible to output a flattened graph explicitly for a single entity.

More generally, it would be great if the main JSON-LD variants could be requested, namely:

• Expanded
• Compacted
• Flattened
• Framed
  With appropriate input parameters such as context.

[nicholascar]

I have been interested in this for a long time and increasingly so since pyLD, the "other" JSON-LD python toolkit seems not to be maintained. Also, Gregg Kellog, one of the main JSON-LD implementers, recently passed away, so I think we are now close to critical in terms of on-going JSON-LD support in Python.

[ajnelson-nist]

Asking in case it instigates some design thinking: Where could this support be requested at "call-time"?

From the command line, it seems rdfpipe would be a point of user interaction requesting these output types. What would the right interface for that be? Full media type and profile IRI?

From the Python-space API, would profile be an argument to serialize that just the JSON-LD serializer would recognize by **kwargs consumption?

[WhiteGobo]

i've deleted my last comment, because it was wrong. Sorry.