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  "context": [
    {
      "type": "contextDef",
      "subType": "prefix",
      "key": "",
      "value": {
        "type": "term",
        "subType": "namedNode",
        "value": "http://example/",
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      },
      "loc": {
        "sourceLocationType": "source",
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    {
      "type": "contextDef",
      "subType": "prefix",
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                      "prefix": "rdf"
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                  "subType": "*"
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                  "type": "term",
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  "solutionModifiers": {},
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    "type": "datasetClauses",
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      "sourceLocationType": "noMaterialize"
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}