{
  "type": "ask",
  "input": {
    "type": "filter",
    "input": {
      "type": "extend",
      "input": {
        "type": "bgp",
        "patterns": []
      },
      "variable": {
        "termType": "Variable",
        "value": "n"
      },
      "expression": {
        "type": "expression",
        "subType": "operator",
        "operator": "now",
        "args": []
      }
    },
    "expression": {
      "type": "expression",
      "subType": "operator",
      "operator": "=",
      "args": [
        {
          "type": "expression",
          "subType": "operator",
          "operator": "datatype",
          "args": [
            {
              "type": "expression",
              "subType": "term",
              "term": {
                "termType": "Variable",
                "value": "n"
              }
            }
          ]
        },
        {
          "type": "expression",
          "subType": "term",
          "term": {
            "termType": "NamedNode",
            "value": "http://www.w3.org/2001/XMLSchema#dateTime"
          }
        }
      ]
    }
  }
}