Convert also "partial" lists from RDF to JSON-LD · Issue #277 · json-ld/json-ld.org (original) (raw)

_This came up in a discussion with @afs:_

On Thursday, July 04, 2013 10:21 PM, Andy Seaborne wrote:

The set of all heads of well-formed lists can be found quite easily.

All lists have a common tail (rdf:nil). Just walk back up the list
checking nodes have exactly one rdf:first and one rdf:next triple.
This generates the list head.

You are of course right and the necessary changes to the algorithm should be quite small.

Currently a @list can never be the value of a rdf:first/rdf:rest. This kind of ensures that only "complete" lists are transformed to @list and that we don't produce lists of lists in JSON-LD.

An example might clarify what I mean. Currently we would never produce something like

{
  "@id": "http://example.com/",
  "rdf:first": "A",
  "rdf:rest": { "@list": [ "B", "C", "D" ] }
}

all the list bnodes would be preserved:

[
  {
    "@id": "http://example.com/",
    "rdf:first": "A",
    "rdf:rest": { "@id": "_"b0" }
  },
  {
     "@id": "_:b0",
     "rdf:first": "B"
     "rdf:rest": { "@id": "_:b1" }
  },
  ...
]

(edit: fixed second example)

Arguably changing that would result in a nicer result. This might also be a quite elegant solution for the OpenAnnotation people. I think we could threat this change as an algorithmic bug fix (meaning, no need for another LC).

Thoughts?