{
  "name": "join",
  "description": "Waits for one or more child [fork] operations to finish before proceeding",
  "signature": {
    "children": {
      "fork": {
        "type": "lambda",
        "description": "Fork body to start and wait for; evaluated body node values and children are preserved in the completed fork node",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "OneOrMore",
        "role": "ExecutableBody",
        "evaluation": "SerializeLambda",
        "projection": "Self"
      }
    },
    "scope": {
      "provides": "join"
    },
    "output": {
      "mode": "Lambda",
      "kind": "fork-result-list,node-list",
      "description": "Resolves to the completed [fork] child nodes with evaluated body node values and children preserved"
    }
  }
}