IfcMaterialSelect provides selection of either a material
definition or a material usage definition that can be assigned to
an element, a resource or another entity within this specification.
HISTORY New select in IFC1.0
IFC4 CHANGE The select now includes two new abstract entities IfcMaterialDefinition
and IfcMaterialUsageDefinition with upward compatibility. The use of IfcMaterialList is deprecated from IFC4 onwards.