pandoc/test/command/6752.md

% pandoc -f biblatex -t csljson
@xdata{XDPubAlfredAKnopf,
    publisher   = {Alfred A.~Knopf},
    address     = {New York, NY}
}
@book{Klinkenborg2012,
    author      = {Verlyn Klinkenborg},
    title       = {Several short sentences about writing},
    date        = {2012},
    xdata       = {XDPubAlfredAKnopf},
}
^D
[
  {
    "author": [
      {
        "family": "Klinkenborg",
        "given": "Verlyn"
      }
    ],
    "id": "Klinkenborg2012",
    "issued": {
      "date-parts": [
        [
          2012
        ]
      ]
    },
    "publisher": "Alfred A. Knopf",
    "publisher-place": "New York, NY",
    "title": "Several short sentences about writing",
    "type": "book"
  }
]