Numeric components keyed by their exact EXPRESS attribute name
(ForceX, MomentZ, DisplacementY, DeltaTConstant, …). Only
attributes the file actually carries a finite number for appear; an
omitted ($) optional is absent rather than zero, because zero is a
meaningful load value and conflating the two would invent data.
OptionalconfigurationPresent only for IfcStructuralLoadConfiguration: the nested loads and
the parametric locations they apply at, as StructuralLoadConfigurationInfo.
OptionalnameCanonical EXPRESS type name, e.g. IfcStructuralLoadSingleForce.
One
IfcStructuralLoadOrResultleaf — a force, displacement, temperature or planar/linear force — reduced to its named numeric components.