{
  "context": [
    {
      "type": "contextDef",
      "subType": "prefix",
      "key": "dc",
      "value": {
        "type": "term",
        "subType": "namedNode",
        "value": "http://purl.org/dc/elements/1.1/",
        "loc": {
          "sourceLocationType": "source",
          "start": 13,
          "end": 47
        }
      },
      "loc": {
        "sourceLocationType": "source",
        "start": 0,
        "end": 47
      }
    },
    {
      "type": "contextDef",
      "subType": "prefix",
      "key": "ns",
      "value": {
        "type": "term",
        "subType": "namedNode",
        "value": "http://example.org/ns#",
        "loc": {
          "sourceLocationType": "source",
          "start": 61,
          "end": 85
        }
      },
      "loc": {
        "sourceLocationType": "source",
        "start": 48,
        "end": 85
      }
    }
  ],
  "subType": "select",
  "where": {
    "type": "pattern",
    "subType": "group",
    "patterns": [
      {
        "type": "pattern",
        "subType": "bgp",
        "triples": [
          {
            "type": "triple",
            "subject": {
              "type": "term",
              "subType": "variable",
              "value": "x",
              "loc": {
                "sourceLocationType": "source",
                "start": 118,
                "end": 120
              }
            },
            "predicate": {
              "type": "term",
              "subType": "namedNode",
              "value": "title",
              "loc": {
                "sourceLocationType": "source",
                "start": 121,
                "end": 129
              },
              "prefix": "dc"
            },
            "object": {
              "type": "term",
              "subType": "variable",
              "value": "title",
              "loc": {
                "sourceLocationType": "source",
                "start": 130,
                "end": 136
              }
            },
            "loc": {
              "sourceLocationType": "source",
              "start": 118,
              "end": 136
            }
          }
        ],
        "loc": {
          "sourceLocationType": "source",
          "start": 118,
          "end": 138
        }
      },
      {
        "type": "pattern",
        "subType": "optional",
        "patterns": [
          {
            "type": "pattern",
            "subType": "bgp",
            "triples": [
              {
                "type": "triple",
                "subject": {
                  "type": "term",
                  "subType": "variable",
                  "value": "x",
                  "loc": {
                    "sourceLocationType": "source",
                    "start": 160,
                    "end": 162
                  }
                },
                "predicate": {
                  "type": "term",
                  "subType": "namedNode",
                  "value": "price",
                  "loc": {
                    "sourceLocationType": "source",
                    "start": 163,
                    "end": 171
                  },
                  "prefix": "ns"
                },
                "object": {
                  "type": "term",
                  "subType": "variable",
                  "value": "price",
                  "loc": {
                    "sourceLocationType": "source",
                    "start": 172,
                    "end": 178
                  }
                },
                "loc": {
                  "sourceLocationType": "source",
                  "start": 160,
                  "end": 178
                }
              }
            ],
            "loc": {
              "sourceLocationType": "source",
              "start": 160,
              "end": 180
            }
          },
          {
            "type": "pattern",
            "subType": "filter",
            "expression": {
              "type": "expression",
              "subType": "operation",
              "operator": "<",
              "args": [
                {
                  "type": "term",
                  "subType": "variable",
                  "value": "price",
                  "loc": {
                    "sourceLocationType": "source",
                    "start": 189,
                    "end": 195
                  }
                },
                {
                  "type": "term",
                  "subType": "literal",
                  "value": "30",
                  "langOrIri": {
                    "type": "term",
                    "subType": "namedNode",
                    "value": "http://www.w3.org/2001/XMLSchema#integer",
                    "loc": {
                      "sourceLocationType": "noMaterialize"
                    }
                  },
                  "loc": {
                    "sourceLocationType": "source",
                    "start": 198,
                    "end": 200
                  }
                }
              ],
              "loc": {
                "sourceLocationType": "source",
                "start": 188,
                "end": 201
              }
            },
            "loc": {
              "sourceLocationType": "source",
              "start": 181,
              "end": 201
            }
          }
        ],
        "loc": {
          "sourceLocationType": "source",
          "start": 149,
          "end": 203
        }
      }
    ],
    "loc": {
      "sourceLocationType": "source",
      "start": 116,
      "end": 213
    }
  },
  "solutionModifiers": {},
  "datasets": {
    "type": "datasetClauses",
    "clauses": [],
    "loc": {
      "sourceLocationType": "noMaterialize"
    }
  },
  "variables": [
    {
      "type": "term",
      "subType": "variable",
      "value": "title",
      "loc": {
        "sourceLocationType": "source",
        "start": 94,
        "end": 100
      }
    },
    {
      "type": "term",
      "subType": "variable",
      "value": "price",
      "loc": {
        "sourceLocationType": "source",
        "start": 101,
        "end": 107
      }
    }
  ],
  "loc": {
    "sourceLocationType": "inlinedSource",
    "newSource": "PREFIX  dc:  <http://purl.org/dc/elements/1.1/>\nPREFIX  ns:  <http://example.org/ns#>\nSELECT  ?title ?price\nWHERE   { ?x dc:title ?title .\n          OPTIONAL { ?x ns:price ?price . FILTER (?price < 30) }\n        }\n",
    "start": 0,
    "end": 9007199254740991,
    "loc": {
      "sourceLocationType": "source",
      "start": 0,
      "end": 213
    },
    "startOnNew": 0,
    "endOnNew": 213
  },
  "type": "query"
}