{
  "type": "project",
  "input": {
    "type": "bgp",
    "patterns": [
      {
        "type": "pattern",
        "termType": "Quad",
        "subject": {
          "termType": "NamedNode",
          "value": "http://example.com/ns#s"
        },
        "predicate": {
          "termType": "NamedNode",
          "value": "http://example.com/ns#r"
        },
        "object": {
          "type": "pattern",
          "termType": "Quad",
          "subject": {
            "termType": "Variable",
            "value": "S"
          },
          "predicate": {
            "termType": "NamedNode",
            "value": "http://example.com/ns#p"
          },
          "object": {
            "termType": "NamedNode",
            "value": "http://example.com/ns#o"
          },
          "graph": {
            "termType": "DefaultGraph",
            "value": ""
          }
        },
        "graph": {
          "termType": "DefaultGraph",
          "value": ""
        }
      },
      {
        "type": "pattern",
        "termType": "Quad",
        "subject": {
          "termType": "NamedNode",
          "value": "http://example.com/ns#s"
        },
        "predicate": {
          "termType": "NamedNode",
          "value": "http://example.com/ns#q"
        },
        "object": {
          "type": "pattern",
          "termType": "Quad",
          "subject": {
            "termType": "NamedNode",
            "value": "http://example.com/ns#s1"
          },
          "predicate": {
            "termType": "NamedNode",
            "value": "http://example.com/ns#r"
          },
          "object": {
            "type": "pattern",
            "termType": "Quad",
            "subject": {
              "termType": "Variable",
              "value": "S"
            },
            "predicate": {
              "termType": "NamedNode",
              "value": "http://example.com/ns#p"
            },
            "object": {
              "termType": "NamedNode",
              "value": "http://example.com/ns#o"
            },
            "graph": {
              "termType": "DefaultGraph",
              "value": ""
            }
          },
          "graph": {
            "termType": "DefaultGraph",
            "value": ""
          }
        },
        "graph": {
          "termType": "DefaultGraph",
          "value": ""
        }
      }
    ]
  },
  "variables": [
    {
      "termType": "Variable",
      "value": "S"
    }
  ]
}