The %CustomStorage class contains a set of empty storage interface methods.
The %CustomStorage class serves as a storage class for objects in which you
plan on providing your own storage interface methods. It is assumed that
these methods will override all of the methods listed here.
parameter SQLENABLED = 0;
SQLENABLED controls the projection of a persistent class to SQL. If TRUE,
then an SQL table will be created during compilation that is based on the
class. For classes using %Library.CustomStorage, the data model projected
is based on the SQL maps defined in the storage definition.