#### IfcPropertySingleValue

Natural language names

##### Semantic definitions at the entity

Entity definition

A 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, the value with measure type (and optionally the unit) is given.

The unit is handled by the Unit attribute:

- 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.

Examples of a property with single value are:

Name | NominalValue | Type (through IfcValue) | Unit
Description | Manufacturer "A" door | IfcLabel | -
PanelThickness | 0.12 | IfcPositiveLengthMeasure | -
ThermalTransmittance | 2.6 | IfcThermalTransmittanceMeasure | W/(m2K)

> HISTORY: New entity in IFC Release 1.0. The entity has been renamed from IfcSimpleProperty in IFC Release 2x

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
3 | NominalValue | - |  | This attribute is out of scope for this model view definition and shall not be set. |
4 | Unit | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcProperty
1 | Name | IfcIdentifier | [1:1] | Name for this property. This label is the significant name string that defines the semantic meaning for the property. | X
2 | Description | - |  | This attribute is out of scope for this model view definition and shall not be set. |
IfcSimpleProperty
IfcPropertySingleValue
3 | NominalValue | - |  | This attribute is out of scope for this model view definition and shall not be set. |
4 | Unit | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Formal representations

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;

EXPRESS-G diagram

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