Tree view

module: address
    +--rw addresses
       +--rw address* [last-name first-name]
          +--rw last-name     string
          +--rw first-name    string
          +--rw street?       string
          +--rw city?         string
          +--rw zipcode?      string
          +--rw phone* [phone-type]
             +--rw phone-type      enumeration
             +--rw phone-number    string