A qualified to-many relation is a to-many relation qualified by an attribute in the related class. The qualified to-many is implemented by a collection of pointers using the OMMap template.
All the manipulation methods are the same as described in To-many relations. In addition, the following key qualified methods are provided.
F* getRole(type key) const; void addRole(type key, F* p_F); void removeRole(type key);