{
  "type": "project",
  "input": {
    "type": "graph",
    "input": {
      "type": "bgp",
      "patterns": [
        {
          "type": "pattern",
          "termType": "Quad",
          "subject": {
            "termType": "NamedNode",
            "value": "http://www.example.org/instance#a"
          },
          "predicate": {
            "termType": "NamedNode",
            "value": "http://www.example.org/schema#p1"
          },
          "object": {
            "termType": "Variable",
            "value": "var0"
          },
          "graph": {
            "termType": "DefaultGraph",
            "value": ""
          }
        },
        {
          "type": "pattern",
          "termType": "Quad",
          "subject": {
            "termType": "Variable",
            "value": "var0"
          },
          "predicate": {
            "termType": "NamedNode",
            "value": "http://www.example.org/schema#p2"
          },
          "object": {
            "termType": "Variable",
            "value": "x"
          },
          "graph": {
            "termType": "DefaultGraph",
            "value": ""
          }
        }
      ]
    },
    "name": {
      "termType": "Variable",
      "value": "g"
    }
  },
  "variables": [
    {
      "termType": "Variable",
      "value": "x"
    }
  ]
}