{
  "@context": [{
    "@version": 1.1,
    "@protected": true,
    "@vocab": "http://example.com/",
    "Parent": {"@context": {"@protected": true, "foo": {"@type": "@id"}}}
  }, {
    "@version": 1.1,
    "@protected": true,
    "Child": {"@context": {"@protected": true, "foo": {"@type": "@id"}}}
  }],
  "@type": "Parent",
  "foo": {
    "@type": "Child",
    "foo": "http://example.com/test"
  }
}
