569
569
def check_conversion_target(self, target_format):
570
570
if self.rich_root_data and not target_format.rich_root_data:
571
571
raise errors.BadConversionTarget(
573
574
if (self.supports_tree_reference and
574
575
not getattr(target_format, 'supports_tree_reference', False)):
575
576
raise errors.BadConversionTarget(