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      "type": "contextDef",
      "subType": "prefix",
      "key": "",
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        "type": "term",
        "subType": "namedNode",
        "value": "http://example.com/ns#",
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          "sourceLocationType": "source",
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      },
      "loc": {
        "sourceLocationType": "source",
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      "type": "contextDef",
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      "loc": {
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  "subType": "select",
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    "type": "pattern",
    "subType": "group",
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        "type": "pattern",
        "subType": "bgp",
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            "type": "triple",
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              "value": "s",
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                "sourceLocationType": "source",
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              "prefix": ""
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              "type": "term",
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                "type": "tripleCollection",
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                    "type": "triple",
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                        "sourceLocationType": "noMaterialize"
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                            "langOrIri": {
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                                "end": 208
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                              "prefix": "xsd"
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                    "type": "triple",
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                            "type": "term",
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                          "sourceLocationType": "noMaterialize"
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                    },
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                    }
                  }
                ],
                "identifier": {
                  "type": "term",
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                    "sourceLocationType": "noMaterialize"
                  },
                  "label": "g_0"
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            ],
            "loc": {
              "sourceLocationType": "source",
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        ],
        "loc": {
          "sourceLocationType": "source",
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    ],
    "loc": {
      "sourceLocationType": "source",
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  },
  "solutionModifiers": {},
  "datasets": {
    "type": "datasetClauses",
    "clauses": [],
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      "sourceLocationType": "noMaterialize"
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  },
  "variables": [
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      "type": "wildcard",
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  ],
  "loc": {
    "sourceLocationType": "inlinedSource",
    "newSource": "PREFIX :        <http://example.com/ns#>\nPREFIX xsd:     <http://www.w3.org/2001/XMLSchema#>\n\nSELECT * {\n   :s :p :o {| :source [ :graph <http://host1/> ;\n                         :date \"2020-01-20\"^^xsd:date\n                       ] ;\n               ?source [ :graph <http://host2/> ;\n                         :date \"2020-12-31\"^^xsd:date\n                       ]\n             |}\n}\n",
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    "startOnNew": 0,
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}