These UDTs won't be terribly useful if they exist just in the database. They are a liability in that case. The real value is in the fact that they can be used in the database and in applications. The same stuct source code is used in both places.

There are certainly limits to their usefulness if the the UDTs cannot have methods associated with them since they seem to be defined as "struct" (IIRC from the article). Applications would probably add wrapper classes with methods that provide useful functions, but at least the basic data definition is in one place.

Does someone know for sure that these have to be defined as "struct" and can structs have private members and/or methods (public or private)?