OptionaldroppedWhy value is absent; absent whenever value is present.
OptionallocationThe Locations row at this same slot, when the file carries one. Absent
when the file omits the optional Locations, lists fewer rows than
Values has slots, or writes this row as $ / with a non-numeric cell
(the row keeps its position as an empty placeholder in locations).
OptionalvalueThe nested load, absent when the slot could not be read.
One
Valuesslot of anIfcStructuralLoadConfiguration, with its location.