{
  "@context": {
    "@vocab": "http://vocab.org/",
    "prop1": {}
  },
  "@id": "ex:outer",
  "foo": {
    "@context": {
      "@vocab": "http://vocab.override.org/"
    },
    "@id": "ex:inner",
    "prop1": "baz1",
    "prop2": "baz2"
  }
}
