Defined in File Ifc4.h
IfcSIUnit: public Ifc4::IfcNamedUnit¶
Definition from ISO/CD 10303-41:1992: An SI unit is the fixed quantity used as a standard in terms of which items are measured as defined by ISO 1000 (clause 2).
IfcSIUnit covers both standard base SI units such as meter and second, and derived SI units such as Pascal, square meter and cubic meter.
NOTE Corresponding ISO 10303 name: si_unit, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
HISTORY New entity in IFC Release 1.5.1.
The SI Prefix for defining decimal multiples and submultiples of the unit.
The word, or group of words, by which the SI unit is referred to.
NOTE Even though the SI system’s base unit for mass is kilogram, the IfcSIUnit for mass is gram if no Prefix is asserted.