{
  "empty": {},
  "sort": [
    {
      "author": [
        {
          "family": "b"
        }
      ],
      "id": "b"
    },
    {
      "author": [
        {
          "family": "a"
        }
      ],
      "id": "a"
    }
  ],
  "sortSpecial": [
    {
      "id": "g",
      "author": [{ "family": "b" }],
      "issued": { "date-parts": [[2018]] },
      "title": "a",
      "page": "123-456",
      "edition": "2nd"
    },
    {
      "id": "f",
      "author": [{ "family": "b" }],
      "issued": { "date-parts": [[2018]] },
      "title": "a",
      "page": "456-789",
      "edition": "2nd"
    },
    {
      "id": "e",
      "author": [{ "family": "b" }],
      "issued": { "date-parts": [[2018]] },
      "title": "a",
      "page": "123-456",
      "edition": 1
    },
    {
      "id": "d",
      "author": [{ "family": "b" }],
      "issued": { "date-parts": [[2018]] }
    },
    {
      "id": "c",
      "author": [{ "family": "a" }],
      "issued": { "date-parts": [[2018]] },
      "title": "b",
      "page": "456-789",
      "edition": "2nd"
    },
    {
      "id": "b",
      "author": [{ "family": "a" }],
      "issued": { "date-parts": [[2018]] },
      "title": "a",
      "page": "456-789",
      "edition": "2nd"
    },
    {
      "id": "a",
      "author": [{ "literal": "a" }],
      "issued": { "date-parts": [[2017]] },
      "title": "a",
      "page": "456-789",
      "edition": "2nd"
    }
  ],
  "ids": [
    {
      "id": "b"
    },
    {
      "id": "a"
    }
  ],
  "invalid": [
    {
      "id": "a",
      "invalid": "foo"
    }
  ]
}