text: {
    "@context": {
      "dc": "http://purl.org/dc/elements/1.1/",
      "ex": "http://example.org/vocab#",
      "ex:contains": {
        "@type": "@id"
      }
    },
    "@id": "http://example.org/test#library",
    "ex:contains": {
      "@id": "http://example.org/test#book",
      "dc:contributor": "Writer",
      "dc:title": "My Book",
      "ex:contains": {
        "@id": "http://example.org/test#chapter",
        "dc:description": "Fun",
        "dc:title": "Chapter One"
      }
    }
  }