JSON Schema Graph Extensions [WIP]

[kellrott]

Current issues:

• The object edge declaration feels a little weird
• It’s not clear which field should be used as the primary id for a vertex. We kind of assume id. Should it be configurable?
• It’s kind of assumed that every ‘top level’ object is a vertex. Should we make that explicit?
• If there are multiple possible targets, it’s not clear how to select the correct one (and avoid generating multiple invalid backrefs)
• We need to be more explicit about how object link fields are parsed to get the destination id

[bwalsh]

Implemented in #17