{
  "@context": {
    "dc": "http://purl.org/dc/elements/1.1/",
    "ex": "http://example.org/vocab#"
  },
  "@graph": [{
    "@id": "http://example.org/test/#library",
    "@type": "ex:Library",
    "ex:contains": {
      "@id": "http://example.org/test#untyped",
      "dc:contributor": "Writer",
      "dc:title": "My Book"
    }
  }]
}