Consider data transformation in a JSON-LD infrastructure

[azaroth42]

Issue #397 introduces the idea of adding extra data to the graph when processing a context document. In this case, the transformation of a list of lists in the JSON structure to resources with specific types and predicates.

The W3C WG has considered the issue (https://github.com/w3c/json-ld-syntax/issues/7), but does not believe that it has received enough attention in the community group in terms of scope or functionality, and would be greatly appreciative if the CG could take it up in more detail. It would be beneficial to have a broad survey of the approaches to data transformation in this way, and the definition of more specific use cases in which this would be applicable.

That work could be fed back to the current WG depending on time frames, or to a future "2.0" WG.