{
  "name": "add",
  "description": "Appends source nodes to selected destination containers",
  "signature": {
    "input": {
      "kind": "node-list,single-object",
      "description": "Expression selecting destination container node or nodes whose children should receive the source nodes",
      "required": true,
      "mode": "Expression"
    },
    "children": {
      "*": {
        "type": "lambda",
        "kind": "node-list",
        "description": "Source container or node-producing slot evaluated before its child nodes are applied to the selected target location",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "OneOrMore",
        "role": "SourceContainer",
        "evaluation": "EvalSelf",
        "projection": "ChildrenOfChildren"
      }
    }
  }
}