{
  "@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"
    }
  }
}