{
  "name": "null",
  "description": "Returns true if the specified node or expression is null",
  "signature": {
    "input": {
      "kind": "node-list,single-object",
      "description": "Expression selecting the value to test for null",
      "required": true,
      "mode": "Expression"
    },
    "output": {
      "mode": "Value",
      "kind": "boolean",
      "description": "Returns true if the expression resolves to a null value"
    }
  }
}