-- | Database representation of a \<SC_Listing\> contained within a
-- \<Schedule_Change\>, within a \<message\>. During the transition
-- to the database, we drop the intermediate \<Schedule_Change\>
-- | Database representation of a \<SC_Listing\> contained within a
-- \<Schedule_Change\>, within a \<message\>. During the transition
-- to the database, we drop the intermediate \<Schedule_Change\>