 | Auf Umrechnung basierte Einheit mit Abzug |
 | Conversion Based Unit With Offset |
 | Unité basée sur une mesure avec unité et avec décalage |
| Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
|---|---|---|---|---|
| IfcConversionBasedUnitWithOffset | ADDED |
IfcConversionBasedUnitWithOffset is a unit which is converted from another unit by applying a conversion factor and an offset.
HISTORY New entity in IFC4.
Example: The temperature unit Fahrenheit is based on the temperature unit Kelvin as follows:
f = k · 1.8 – 459.67
wherein k is an absolute temperature expressed in Kelvin and f is the same temperature in Fahrenheit. The following entity instances provide Fahrenheit as a unit:
IfcConversionBasedUnitWithOffset(
IfcDimensionalExponents(0, 0, 0, 0, 1, 0, 0),
THERMODYNAMICTEMPERATUREUNIT,
'Fahrenheit',
IfcMeasureWithUnit(
IfcThermodynamicTemperatureMeasure(1.8),
IfcSiUnit(THERMODYNAMICTEMPERATUREUNIT, ?, KELVIN)),
-459.67);
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 5 | ConversionOffset | IfcReal | A positive or negative offset to add after the inherited ConversionFactor was applied. | X |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| IfcNamedUnit | |||||
| 1 | Dimensions | IfcDimensionalExponents | The dimensional exponents of the SI base units by which the named unit is defined. | X | |
| 2 | UnitType | IfcUnitEnum | The type of the unit. | X | |
| IfcConversionBasedUnit | |||||
| 3 | Name | IfcLabel | The word, or group of words, by which the conversion based unit is referred to. | X | |
| 4 | ConversionFactor | IfcMeasureWithUnit | The physical quantity from which the converted unit is derived. | X | |
| HasExternalReference | IfcExternalReferenceRelationship @RelatedResourceObjects | S[0:?] | Reference to external information, e.g. library, classification, or document information, which is associated with the conversion-based unit.
IFC4 CHANGE New inverse attribute. | X | |
| IfcConversionBasedUnitWithOffset | |||||
| 5 | ConversionOffset | IfcReal | A positive or negative offset to add after the inherited ConversionFactor was applied. | X | |
<xs:element name="IfcConversionBasedUnitWithOffset" type="ifc:IfcConversionBasedUnitWithOffset" substitutionGroup="ifc:IfcConversionBasedUnit" nillable="true"/>
<xs:complexType name="IfcConversionBasedUnitWithOffset">
<xs:complexContent>
<xs:extension base="ifc:IfcConversionBasedUnit">
<xs:attribute name="ConversionOffset" type="ifc:IfcReal" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcConversionBasedUnitWithOffset
SUBTYPE OF (IfcConversionBasedUnit);
ConversionOffset : IfcReal;
END_ENTITY;
EXPRESS-G diagram
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