{
  "@context": {
    "dc": "http://purl.org/dc/elements/1.1/",
    "ex": "http://example.org/vocab#",
    "ex:authored": {"@type": "@id"},
    "ex:contains": {"@type": "@id"},
    "foaf": "http://xmlns.com/foaf/0.1/"
  },
  "@graph": [
    {
      "@id": "http://example.org/test#chapter",
      "dc:description": "Fun",
      "dc:title": "Chapter One"
    },
    {
      "@id": "http://example.org/test#jane",
      "ex:authored": "http://example.org/test#chapter",
      "foaf:name": "Jane"
    },
    {
      "@id": "http://example.org/test#john",
      "foaf:name": "John"
    },
    {
      "@id": "http://example.org/test#library",
      "ex:contains": {
        "@id": "http://example.org/test#book",
        "dc:contributor": "Writer",
        "dc:title": "My Book",
        "http://example.org/vocab#contains": "this-is-not-an-IRI"
      }
    }
  ]
}