SimplifiedHierachy.swift

enum Root {}
enum ChatRoom {}

struct Message: Codable {
    var header: String
    var body: String
}

struct Configuration: Codable {
    // Our actual Configuration entity
    var welcomeMessage: String
}

extension Path where Element == Root {
    init() {
        self.init([])
    }
}

extension Path where Element == Root {
    var chatrooms: Path<ChatRoom>.Collection {
        return append("chatrooms")
    }
    var configuration: Path<Configuration> {
        return append("configuration")
    }
}

extension Path where Element == ChatRoom {
    var name: Path<String> {
        return append("name")
    }
    var messages: Path<Message>.Collection {
        return append("messages")
    }
}