#### 8.6.3.5 IfcPropertySingleValue

| Propriété à valeur simple
| Merkmal mit Einzelwert

The property with a single value IfcPropertySingleValue defines a property object which has a single (numeric or descriptive) value assigned. It defines a property - single value combination for which the property Name, an optional Description, and an optional NominalValue with measure type is provided. In addition, the default unit as specified within the project unit context can be overriden by assigning an Unit.

The unit is handled by the Unit attribute, see Table 51 for an example of various single value properties:

- If the Unit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext).
- If the Unit attribute is given, then the unit assigned by the Unit attribute overrides the globally assigned unit.

Name | NominalValue | Type (through IfcValue) | Unit
--- | --- | --- | ---
Description | Manufacturer "A" door | IfcLabel | -
PanelThickness | 0.12 | IfcPositiveLengthMeasure | -
ThermalTransmittance | 2.6 | IfcThermalTransmittanceMeasure | W/(m2K)
Table 51 — Single value properties with values, measure types and units

> HISTORY New entity in IFC1.0.

> IFC2x CHANGE Entity has been renamed from IfcSimpleProperty.

> IFC2x3 CHANGE Attribute NominalValue has been made OPTIONAL with upward compatibility for file based exchange.

XSD Specification:

<xs:element name="IfcPropertySingleValue" type="ifc:IfcPropertySingleValue" substitutionGroup="ifc:IfcSimpleProperty" nillable="true"/>
<xs:complexType name="IfcPropertySingleValue">
<xs:complexContent>
<xs:extension base="ifc:IfcSimpleProperty"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcPropertySingleValue

| SUBTYPE OF (IfcSimpleProperty);

NominalValue | : | OPTIONAL IfcStrippedOptional;
Unit | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

Attribute Definitions:

NominalValue | : | Value and measure type of this property. NOTE By virtue of the defined data type, that is selected from the SELECT IfcValue, the appropriate unit can be found within the IfcUnitAssignment, defined for the project if no value for the unit attribute is given. IFC2x3 CHANGE The attribute has been made optional with upward compatibility for file based exchange.
Unit | : | Unit for the nominal value, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject.

Inheritance Graph:

ENTITY IfcPropertySingleValue

| ENTITY IfcPropertyAbstraction

| INVERSE

| ENTITY IfcProperty

Name | : | IfcIdentifier;
Description | : | OPTIONAL IfcStrippedOptional;

| INVERSE

PartOfPset | : | SET OF IfcPropertySet FOR HasProperties;

| ENTITY IfcSimpleProperty

| ENTITY IfcPropertySingleValue

NominalValue | : | OPTIONAL IfcStrippedOptional;
Unit | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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