8.11.3.10 IfcSIUnit
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AbV ⓘ
8.11.3.10.1 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.
8.11.3.10.2 Entity inheritance
8.11.3.10.3 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. The dimensional exponents of SI units are derived by function IfcDimensionsForSIUnit. |
8.11.3.10.4 Formal representation
ENTITY IfcSIUnit
SUBTYPE OF (IfcNamedUnit);
Prefix : OPTIONAL IfcSIPrefix;
Name : IfcSIUnitName;
DERIVE
SELF\IfcNamedUnit.Dimensions : IfcDimensionalExponents := IfcDimensionsForSIUnit (SELF.Name);
END_ENTITY;