{
  "name": "lambda2csv",
  "description": "Transforms a lambda hierarchy into CSV",
  "signature": {
    "input": {
      "kind": "node-list",
      "description": "Expression selecting the nodes (rows) to transform",
      "required": true,
      "mode": "Expression"
    },
    "children": {
      "null-value": {
        "type": "string",
        "kind": "null-value",
        "description": "String used to represent null values",
        "required": false,
        "mode": "ValueOrExpression",
        "cardinality": "ZeroOrOne",
        "default": "[NULL]",
        "role": "Option",
        "projection": "Value"
      }
    },
    "output": {
      "mode": "Both",
      "kind": "csv,text",
      "description": "Resolves to the CSV content in value and column type nodes as children"
    }
  }
}