 | Merkmal mit Einzelwert |
 | Property Single Value |
 | Propriété à valeur simple |
| Item | SPF | XML | Change | Description | 4.0.1.0 |
|---|---|---|---|---|
| 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 348 for an example of various single value properties:
|
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Table 348 — 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 | R |
|---|---|---|---|---|---|
| 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 | - | This attribute is out of scope for this model view definition and shall not be set. |
| # | Attribute | Type | Cardinality | Description | R |
|---|---|---|---|---|---|
| IfcPropertyAbstraction | |||||
| 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. | ||
| 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. | ||
| 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 | - | This attribute is out of scope for this model view definition and shall not be set. | ||
<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:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcPropertySingleValue
SUBTYPE OF (IfcSimpleProperty);
NominalValue : OPTIONAL IfcValue;
Unit : OPTIONAL IfcStrippedOptional;
END_ENTITY;
EXPRESS-G diagram
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