This interface provides only one method disconnect() to give those database connection related object a chance
to clear its connection information.
All classes implementing BlobDomainInterface.prepareForDML() should also implement this interface. Since some external
customer subclassed BlobDomainInterface, adding this method into that interface will break those external subclasses.
Right now only oracle.jbo.domain.Array implements this interface. Other classes need to implement this in the future.