Paths are written for Mentions that are non-arguments but not read back in

[kwalcock]

For the JSON version of Mentions in processors, all values in the paths are written. When they are read back in, only those paths are used for which the mention is among the Mention's arguments.

      json \ "paths" match {
...
           mOp = findMention(mentionID, json, docMap)
            if mOp.nonEmpty
...
...
        json \ "arguments" match {
...
              if (mjson \ "id").extract[String] == mentionID
...

This means that a highly desired (by me) round-trip test is not possible:

1. create mentions
2. serialized them as json1
3. read them back in
4. serialize them as json2
5. compare json1 and json2

I'm not sure what the paths are supposed to be. If the extra ones are some kind of artifact of Odin processing that can't be avoided, perhaps the ones not among the arguments should be abandoned for the JSON serialization.

I'd appreciate being filled in on how these fields are supposed to be related.