Hi Michael, many thanks for explanation.
I considered what you wrote and now I'm making my own class as a callable and I'm going to use append_ddl_listener(). This means I don't need DDLElement and DDL. Best regards Petr -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.