 | Merkmal mit Einzelwert |
 | Property Single Value |
 | Propriété à valeur simple |
| Item | SPF | XML | Change | Description | IFC4 Addendum 1 |
|---|---|---|---|---|
| IfcPropertySingleValue | ||||
| HasConstraints | ADDED | |||
| HasApprovals | ADDED |
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 689 for an example of various single value properties:
|
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Table 689 — 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.
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 3 | NominalValue | IfcValue | ? |
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. | X |
| 4 | Unit | IfcUnit | ? | 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. | X |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| IfcPropertyAbstraction | |||||
| HasExternalReferences | IfcExternalReferenceRelationship @RelatedResourceObjects | S[0:?] | Reference to an external reference, e.g. library, classification, or document information, that is associated to the property definition.
IFC4 CHANGE New inverse attribute. | X | |
| IfcProperty | |||||
| 1 | Name | IfcIdentifier | Name for this property. This label is the significant name string that defines the semantic meaning for the property. | X | |
| 2 | Description | IfcText | ? | Informative text to explain the property. | X |
| PartOfPset | IfcPropertySet @HasProperties | S[0:?] | Reference to the IfcPropertySet by which the IfcProperty is referenced.
IFC4 CHANGE New inverse attribute to navigate from IfcProperty to IfcPropertySet with upward compatibility for file based exchange. | X | |
| PropertyForDependance | IfcPropertyDependencyRelationship @DependingProperty | S[0:?] | The property on whose value that of another property depends. | X | |
| PropertyDependsOn | IfcPropertyDependencyRelationship @DependantProperty | S[0:?] | The relating property on which the value of the property depends. | X | |
| PartOfComplex | IfcComplexProperty @HasProperties | S[0:?] | Reference to the IfcComplexProperty in which the IfcProperty is contained.
IFC4 CHANGE The cardinality has changed to 0..n to allow reuse of instances of IfcProperty in several IfcComplexProperty with upward compatibility for file based exchange. | X | |
| HasConstraints | IfcResourceConstraintRelationship @RelatedResourceObjects | ? S[0:?] | User-defined constraints for the property. | X | |
| HasApprovals | IfcResourceApprovalRelationship @RelatedResourceObjects | ? S[0:?] | User-defined approvals for the property. | X | |
| IfcSimpleProperty | |||||
| IfcPropertySingleValue | |||||
| 3 | NominalValue | IfcValue | ? |
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. | X |
| 4 | Unit | IfcUnit | ? | 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. | X |
<xs:element name="IfcPropertySingleValue" type="ifc:IfcPropertySingleValue" substitutionGroup="ifc:IfcSimpleProperty" nillable="true"/>
<xs:complexType name="IfcPropertySingleValue">
<xs:complexContent>
<xs:extension base="ifc:IfcSimpleProperty">
<xs:sequence>
<xs:element name="NominalValue" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcValue"/>
</xs:complexType>
</xs:element>
<xs:element name="Unit" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcUnit"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcPropertySingleValue
SUBTYPE OF (IfcSimpleProperty);
NominalValue : OPTIONAL IfcValue;
Unit : OPTIONAL IfcUnit;
END_ENTITY;
EXPRESS-G diagram
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