{
  "@context": {
    "ex": "http://example.org/vocab#"
  },
  "@graph": [
    {
      "@id": "_:b0",
      "ex:prop": {
        "@id": "_:b1"
      }
    },
    {
      "@id": "_:a0",
      "ex:prop": {
        "@id": "_:a1"
      }
    }
  ]
}