old_contents: PRIMARY = 0
  
  
  class ValidationError(Exception):
  
      def __init__(self, field, value, reason):
          self.field = field
          self.value = value
          self.reason = reason
  
      def __repr__(self):
          return '%s(%r, %r, %r)' % (self.__class__.__name__,
                                     self.field, self.value, self.reason)
  
      def __str__(self):
          return '%s = %r (%s)' % (self.field.full_name(), self.value,
                                   self.reason)
  
      def __unicode__(self):
          return u'%s = %r (%s)' % (self.field.full_name(), self.value,
                                    self.reason)
  
  
  class MultipleErrors(ValidationError):
  
      def __init__(self, field, value, errors):
          super(MultipleErrors, self).__init__(field, value, 'multiple errors')
          self.errors = errors
  
      def __str__(self):
          return '\n'.join(str(error) for error in self.errors)
  
      def __unicode__(self):
          return u'\n'.join(unicode(error) for error in self.errors)
  
new_contents: PRIMARY = 0
  SECONDARY = 1
  
  
  class ValidationError(Exception):
  
      def __init__(self, field, value, reason):
          self.field = field
          self.value = value
          self.reason = reason
  
      def __repr__(self):
          return '%s(%r, %r, %r)' % (self.__class__.__name__,
                                     self.field, self.value, self.reason)
  
      def __str__(self):
          return '%s = %r (%s)' % (self.field.full_name(), self.value,
                                   self.reason)
  
      def __unicode__(self):
          return u'%s = %r (%s)' % (self.field.full_name(), self.value,
                                    self.reason)
  
  
  class MultipleErrors(ValidationError):
  
      def __init__(self, field, value, errors):
          super(MultipleErrors, self).__init__(field, value, 'multiple errors')
          self.errors = errors
  
      def __str__(self):
          return '\n'.join(str(error) for error in self.errors)
  
      def __unicode__(self):
          return u'\n'.join(unicode(error) for error in self.errors)
  
subject: Add SECONDARY constant.