IFC (IFC4X3_ADD1) development IfcSIUnit Semantic definition

The IfcSIUnit covers both standard base SI units such as meter and second, and derived SI units such as Pascal, square meter and cubic meter. Entity inheritance Attributes

# Attribute Type Description
IfcNamedUnit (2)
1 Dimensions IfcDimensionalExponents

The dimensional exponents of the SI base units by which the named unit is defined.

2 UnitType IfcUnitEnum

The type of the unit.

Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes
IfcSIUnit (3)
3 Prefix OPTIONAL IfcSIPrefix

The SI Prefix for defining decimal multiples and submultiples of the unit.

4 Name IfcSIUnitName

The word, or group of words, by which the SI unit is referred to.

1* Dimensions IfcDimensionalExponents

This attribute is formally derived.

IfcDimensionsForSIUnit (SELF.Name)

The dimensional exponents of SI units are derived by function IfcDimensionsForSiUnit.

Table Examples Formal representation

 SUBTYPE OF (IfcNamedUnit);
	Prefix : OPTIONAL IfcSIPrefix;
	Name : IfcSIUnitName;
	 SELF\IfcNamedUnit.Dimensions : IfcDimensionalExponents := IfcDimensionsForSIUnit (SELF.Name);
END_ENTITY; References

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