{
  "@context": {
    "@vocab": "http://example/",
    "t1": {"@context": {"foo": {"@id": "http://example.com/foo"}}},
    "t2": {"@context": {"foo": {"@id": "http://example.org/foo", "@type": "@id"}}}
  },
  "@type": ["t2", "t1"],
  "foo": "urn:bar"
}