+
−add_relation_type('prefered_form')
+
−
+
−rql('SET X prefered_form Y WHERE Y canonical TRUE, X identical_to Y')
+
−commit()
+
−
+
−drop_attribute('EmailAddress', 'canonical')
+
−drop_relation_definition('EmailAddress', 'identical_to', 'EmailAddress')
+
−
+
−if 'see_also' in schema:
+
−    sync_schema_props_perms('see_also', syncprops=False, syncrdefs=False)