  We claim that both multipartiteness and localization of subsystems of
compound quantum systems are of an essentially relative nature crucially
depending on the set of operationalistically available states. In a more
general setting, to capture the relativity and variability of our structures
with respect to the observation means, sheaves of algebras may need be
introduced. We provide the general formalism based on algebras which exhibits
the relativity of multipartiteness and localization.
