XmlmmCIF equivalent: refine_occupancy Data items in the REFINE_OCCUPANCY category record details about the treatment of atomic occupancies during refinement. XmlmmCIF equivalent: refine_occupancy/details A description of special aspects of the occupancy refinement for a class of atoms described in _refine_occupancy.class. XmlmmCIF equivalent: refine_occupancy/treatment The treatment of occupancy refinement for a class of atoms described in _refine_occupancy.class. XmlmmCIF equivalent: refine_occupancy/value The value of occupancy assigned to a class of atoms defined in _refine_occupancy.class. Meaningful only for atoms with fixed occupancy. XmlmmCIF equivalent: refine_occupancy/class The class of atoms treated similarly for occupancy refinement.