The poem does convey a message, though the message can not be at every point decoded. (BNC)
This is particularly relevant to non-ELT materials since they were produced to convey a message to a particular audience. (BNC)
It was one of the worst years ever for the construction industry and many a card this Christmas carried a message that 1992 was a good year to see the back of and the hope that in 1993 things may start to look brighter. (BNC)