[
  {
    "@id": "_:b0",
    "http://example.org/foo": [ { "@value": "Foo" } ]
  },
  {
    "@id": "_:b1",
    "http://example.org/bar": [ { "@id": "_:b0" } ]
  },
  {
    "@id": "http://example.org/origin",
    "http://example.org/bar": [ { "@id": "_:b0" } ]
  }
]