container collapsing, parent ref

[bdarcus]

Something not possible in 1.0, but is in M. Should be able to do this with a simple option parameter?

citation-style-language/schema#436

This primarily relevant in note-based styles, as in this example, and at times in author-date.

Maybe just:

collapse-container: true # list container once in bibliography, and cite by "in" reference to that

In order to implement this, need to also implement relational linking in InputReference.

---
chapter1:
  title: Chapter title
  parent: container1
container1:
  title: Edited book title

I could rely on YAML linking, but probably best not, since I also want to keep JSON support.

Another wrinkle with that is where editor goes.