{
  "name": "strings.concat",
  "description": "Concatenates strings",
  "signature": {
    "input": {
      "kind": "string-list",
      "description": "Expression yielding the text segments to concatenate when not supplied as child nodes",
      "required": false,
      "mode": "Expression"
    },
    "children": [
      {
        "type": "string",
        "kind": "text",
        "description": "Text segment to concatenate",
        "required": false,
        "mode": "ExecutableLambda",
        "cardinality": "ZeroOrMore",
        "role": "SourceExpression",
        "evaluation": "EvalSelf",
        "projection": "Value"
      }
    ],
    "constraints": [
      {
        "description": "Provide either expression input or child text segments",
        "values": [
          "input",
          "."
        ],
        "kind": "ExactlyOneOf"
      }
    ],
    "output": {
      "mode": "Value",
      "kind": "text",
      "description": "Resolves to the concatenated string"
    }
  }
}