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  "context": [
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      "type": "contextDef",
      "subType": "prefix",
      "key": "foaf",
      "value": {
        "type": "term",
        "subType": "namedNode",
        "value": "http://xmlns.com/foaf/0.1/",
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      "loc": {
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        "subType": "service",
        "silent": false,
        "name": {
          "type": "term",
          "subType": "namedNode",
          "value": "http://people.example.org/sparql",
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          {
            "type": "pattern",
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                "type": "pattern",
                "subType": "service",
                "silent": false,
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                  "subType": "namedNode",
                  "value": "http://people2.example.org/sparql",
                  "loc": {
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                },
                "patterns": [
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        ],
        "loc": {
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    ],
    "loc": {
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  },
  "solutionModifiers": {},
  "datasets": {
    "type": "datasetClauses",
    "clauses": [],
    "loc": {
      "sourceLocationType": "noMaterialize"
    }
  },
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      "type": "term",
      "subType": "variable",
      "value": "person",
      "loc": {
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      }
    },
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      "value": "interest",
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    },
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      "type": "term",
      "subType": "variable",
      "value": "known",
      "loc": {
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        "end": 75
      }
    }
  ],
  "loc": {
    "sourceLocationType": "inlinedSource",
    "newSource": "PREFIX foaf:   <http://xmlns.com/foaf/0.1/>\nSELECT ?person ?interest ?known\nWHERE\n{\n  SERVICE <http://people.example.org/sparql> { \n    ?person foaf:name ?name .  \n    OPTIONAL { \n      ?person foaf:interest ?interest .\n      SERVICE <http://people2.example.org/sparql> { \n        ?person foaf:knows ?known . } }\n  }    \n}\n",
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    "end": 9007199254740991,
    "loc": {
      "sourceLocationType": "source",
      "start": 0,
      "end": 322
    },
    "startOnNew": 0,
    "endOnNew": 322
  },
  "type": "query"
}