{
  "@context": {
    "ex": "http://example.org/vocab#",
    "ex:validFrom": {
      "@type": "xsd:dateTime"
    },
    "xsd": "http://www.w3.org/2001/XMLSchema#"
  },
  "@id": "http://example.org/test#example",
  "ex:validFrom": "2011-01-25T00:00:00Z"
}