{
  "name": "filter",
  "description": "Filters selected nodes using the child lambda as a predicate",
  "signature": {
    "input": {
      "kind": "node-list",
      "description": "Expression selecting the nodes to filter",
      "required": true,
      "mode": "Expression"
    },
    "children": {
      "*": {
        "type": "lambda",
        "kind": "boolean",
        "description": "Predicate body evaluated once per selected node; the selected node is kept when the body returns true",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "OneOrMore",
        "role": "Condition",
        "evaluation": "EvalSelf",
        "projection": "ReturnedResult"
      }
    },
    "output": {
      "mode": "Lambda",
      "kind": "node-list",
      "description": "Resolves to clones of the selected nodes whose predicate body returns true"
    }
  }
}