class MiracleData(Miracle):
     users = Each(MiracleUsers)
 class MiracleData(Miracle):
     countries = Each("country", MiracleCountry)
 class MiracleUsers(Miracle):
     users = Each(MiracleUser)
 class MiracleCountry(Miracle):
     name = At("name", is_attr=True)
     rank = At("rank", convertion=int)
     year = At("year", convertion=int)
     neigbors = Each("neighbor", MiracleNeigbor)