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      "type": "contextDef",
      "subType": "prefix",
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        "type": "term",
        "subType": "namedNode",
        "value": "http://purl.org/dc/elements/1.1/",
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    },
    {
      "type": "contextDef",
      "subType": "prefix",
      "key": "",
      "value": {
        "type": "term",
        "subType": "namedNode",
        "value": "http://example.org/book/",
        "loc": {
          "sourceLocationType": "source",
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          "end": 88
        }
      },
      "loc": {
        "sourceLocationType": "source",
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    {
      "type": "contextDef",
      "subType": "prefix",
      "key": "ns",
      "value": {
        "type": "term",
        "subType": "namedNode",
        "value": "http://example.org/ns#",
        "loc": {
          "sourceLocationType": "source",
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        }
      },
      "loc": {
        "sourceLocationType": "source",
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  "subType": "select",
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    "subType": "group",
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      {
        "type": "pattern",
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          {
            "type": "triple",
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              },
              "prefix": "dc"
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            "type": "triple",
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                "sourceLocationType": "noMaterialize"
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            "predicate": {
              "type": "term",
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              "type": "term",
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        "type": "pattern",
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        ],
        "values": [
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            "title": {
              "type": "term",
              "subType": "literal",
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              "loc": {
                "sourceLocationType": "source",
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          },
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            "book": {
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                "sourceLocationType": "source",
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                "end": 281
              },
              "prefix": ""
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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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  },
  "variables": [
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      "type": "term",
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      }
    }
  ],
  "loc": {
    "sourceLocationType": "inlinedSource",
    "newSource": "PREFIX dc:   <http://purl.org/dc/elements/1.1/> \nPREFIX :     <http://example.org/book/> \nPREFIX ns:   <http://example.org/ns#> \n\nSELECT ?book ?title ?price\n{\n   ?book dc:title ?title ;\n         ns:price ?price .\n   VALUES (?book ?title)\n   { (UNDEF \"SPARQL Tutorial\")\n     (:book2 UNDEF)\n   }\n}\n",
    "start": 0,
    "end": 9007199254740991,
    "loc": {
      "sourceLocationType": "source",
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      "end": 295
    },
    "startOnNew": 0,
    "endOnNew": 295
  },
  "type": "query"
}