text: class DataVaultException(Exception) :
      def __init__(self, reason=""):
          self.value = reason
  
      def __str__(self) :
          return "{0}".format(self.value)
  
  class Malformed(DataVaultException):
      pass
  
  class Unauthorized(DataVaultException):
      pass
  
  class NotFound(DataVaultException):
      pass
  