{
  "@graph": [{
    "@id": "http://example.org/default_graph",
    "http://example/property": {"@id": "http://example.org/A"}
  },
  {
    "@id": "http://example.org/named_graph",
    "@graph": {
      "@id": "http://example.org/C",
      "http://example/extends": {"@id": "http://example.org/B"}
    }
  }]
}