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+```
+% 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"
+  }
+]
+```