gistfile1.scala

serve {
  case "api" :: "user" :: id :: _ Get _ => userDetails(id)
}

gistfile2.scala

serve {
  case "api" :: "user" :: id :: _ XmlGet _ => userDetails(id)
  case "api" :: "user" :: "add" :: _ XmlPost xml -> _ => addUser(xml)
  case x => x match {
    case "api" :: "user" :: "update" :: _ XmlPut xml -> _ => updateUser(xml)
    case "api" :: "user" :: id :: _ XmlDelete _ => deleteUser(id)
    case _ => NotFoundResponse("Bad URI")
  }
}

gistfile3.scala

serve {
  case "api" :: "user" :: userId :: "address" :: addrId :: _ XmlGet _ => addressDetails(userId, addrId)
}