{
  "@context": {
    "@vocab": "http://example/",
    "idmap": {"@container": "@id"}
  },
  "idmap": {
    "http://example.org/foo": {"@id": "http://example.org/bar", "label": "Object with @id <foo>"},
    "_:bar": {"@id": "_:foo", "label": "Object with @id _:bar"}
  }
}