{
  "@context": {
    "dc": "http://purl.org/dc/elements/1.1/",
    "ex": "http://example.org/vocab#"
  },
  "@type": "ex:Library",
  "ex:contains": {
    "@explicit":true,
    "dc:title":{"@default":"Title missing"},
    "dc:creator":{}
  }
}