Method Mapping.ShadowedMapping()->create()

Method create: void Mapping.ShadowedMapping(mapping|ShadowedMapping parent, mapping|void shadow, int(0..1)|void modify_parent)
Parameter parent: Mapping to be shadowed.
Parameter shadow: Initial shadow of parent .
Parameter modify_parent: Modifications should be done to parent rather than to shadow . If this is set, only entries that are already present in shadow can be modified by later operations.