type Node {
    Name string `json:"name" binding:"min=1"`
    Children []Node `json:"children" binding:"max=100"`
    Next *Node `json:"next,omitempty"`
    Lookup map[string]Node `json:"lookup,omitempty"`
}

type Branch {
    Leaf *Leaf `json:"leaf"`
}

type Leaf {
    Branch *Branch `json:"branch"`
}

@server (group: trees)
service recursive-example {
    @handler tree
    get /tree returns (Node)

    @handler forest
    get /forest returns ([]Node)

    @handler optional
    get /optional returns (*Node)

    @handler raw
    @response raw
    get /raw returns (Node)

    @handler pair
    get /pair returns (Branch)
}