Natural language names
Auf Umrechnung basierte Einheit mit Abzug
Conversion Based Unit With Offset
Unité basée sur une mesure avec unité et avec décalage
Change log
IFC2x3 to IFC4
Semantic definitions at the entity
Entity definition

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:

    IfcDimensionalExponents(0, 0, 0, 0, 1, 0, 0),
Attribute definitions
#AttributeTypeCardinalityDescription G
5ConversionOffsetIfcReal A positive or negative offset to add after the inherited ConversionFactor was applied. X
Inherited definitions from supertypes
Entity inheritance IfcConversionBasedUnit IfcNamedUnit
Attribute inheritance
1DimensionsIfcDimensionalExponents The dimensional exponents of the SI base units by which the named unit is defined.X
2UnitTypeIfcUnitEnum The type of the unit.X
3NameIfcLabel The word, or group of words, by which the conversion based unit is referred to.X
4ConversionFactorIfcMeasureWithUnit The physical quantity from which the converted unit is derived.X
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.
5ConversionOffsetIfcReal A positive or negative offset to add after the inherited ConversionFactor was applied. X
Formal representations
XML Specification
 <xs:element name="IfcConversionBasedUnitWithOffset" type="ifc:IfcConversionBasedUnitWithOffset" substitutionGroup="ifc:IfcConversionBasedUnit" nillable="true"/>
 <xs:complexType name="IfcConversionBasedUnitWithOffset">
   <xs:extension base="ifc:IfcConversionBasedUnit">
    <xs:attribute name="ConversionOffset" type="ifc:IfcReal" use="optional"/>
EXPRESS Specification
ENTITY IfcConversionBasedUnitWithOffset
 SUBTYPE OF (IfcConversionBasedUnit);
  ConversionOffset : IfcReal;

Link to EXPRESS-G diagram EXPRESS-G diagram

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