{
  "type": "construct",
  "input": {
    "type": "graph",
    "input": {
      "type": "extend",
      "input": {
        "type": "bgp",
        "patterns": [
          {
            "type": "pattern",
            "termType": "Quad",
            "subject": {
              "termType": "Variable",
              "value": "s"
            },
            "predicate": {
              "termType": "Variable",
              "value": "p"
            },
            "object": {
              "termType": "Variable",
              "value": "o"
            },
            "graph": {
              "termType": "DefaultGraph",
              "value": ""
            }
          }
        ]
      },
      "variable": {
        "termType": "Variable",
        "value": "t"
      },
      "expression": {
        "type": "expression",
        "subType": "term",
        "term": {
          "type": "pattern",
          "termType": "Quad",
          "subject": {
            "termType": "Variable",
            "value": "s"
          },
          "predicate": {
            "termType": "Variable",
            "value": "p"
          },
          "object": {
            "termType": "Variable",
            "value": "o"
          },
          "graph": {
            "termType": "DefaultGraph",
            "value": ""
          }
        }
      }
    },
    "name": {
      "termType": "Variable",
      "value": "g"
    }
  },
  "template": [
    {
      "type": "pattern",
      "termType": "Quad",
      "subject": {
        "termType": "Variable",
        "value": "t"
      },
      "predicate": {
        "termType": "NamedNode",
        "value": "http://example.com/ns#graph"
      },
      "object": {
        "termType": "Variable",
        "value": "g"
      },
      "graph": {
        "termType": "DefaultGraph",
        "value": ""
      }
    }
  ]
}