5.1.3.45 IfcSimplePropertyTemplate

5.1.3.45.1 Semantic definition

The IfcSimplePropertyTemplate defines the template for all dynamically extensible properties, either the subtypes of IfcSimpleProperty, or the subtypes of IfcPhysicalSimpleQuantity. The individual property templates are interpreted according to their Name attribute and may have a predefined template type, property units, and property measure types. The correct interpretation of the attributes:

PrimaryUnit
SecondaryUnit
PrimaryMeasureType
SecondaryMeasureType

is determined by the TemplateType. The attributes Enumerators and Expression only apply to instances of IfcSimplePropertyTemplate having a particular TemplateType. The TemplateType also controls which subtype of either IfcSimpleProperty or IfcPhysicalSimpleQuantity shall be used for property occurrences corresponding to this template.

The IfcSimplePropertyTemplate is part of the set of templates included in the IfcPropertySetTemplate. The template can be accessed through the inverse attribute PartOfPsetTemplate The IfcPropertySetTemplate may define one or several instances of IfcPropertySet (or IfcElementQuantity). The definition assignment is established by the objectified relationship IfcRelDefinesByTemplate as shown in Figure 5.1.3.45.A. There is no direct link between an IfcSimplePropertyTemplate and a subtype of either IfcSimpleProperty or IfcPhysicalSimpleQuantity. The definition relationship between the template and the individual properties (or quantities) is established by the Name attributes.

IfcSimplePropertyTemplate figure 1 — Figure 5.1.3.45.A — Property template relationships

5.1.3.45.2 Entity inheritance

5.1.3.45.3 Attributes

#	Attribute	Type	Description
IfcRoot (4)
1	GlobalId	IfcGloballyUniqueId	Assignment of a globally unique identifier within the entire software world.
2	OwnerHistory	OPTIONAL IfcOwnerHistory	Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object, NOTE Only the last modification is stored - either as addition, deletion or modification. IFC4-CHANGE The attribute has been changed to be OPTIONAL.
3	Name	OPTIONAL IfcLabel	Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.
4	Description	OPTIONAL IfcText	Optional description, provided for exchanging informative comments.
IfcPropertyDefinition (2)
	HasContext	SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions	Reference to the relationship IfcRelDeclares and thus to the IfcProject or IfcProjectLibrary.
	HasAssociations	SET [0:?] OF IfcRelAssociates FOR RelatedObjects	Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition.
IfcPropertyTemplate (2)
	PartOfComplexTemplate	SET [0:?] OF IfcComplexPropertyTemplate FOR HasPropertyTemplates	Reference to a complex property template. It should only be provided, if the PropertyType of the referenced complex property template is set to COMPLEX.
	PartOfPsetTemplate	SET [0:?] OF IfcPropertySetTemplate FOR HasPropertyTemplates	Reference to the IfcPropertySetTemplate that defines the scope for the IfcPropertyTemplate. A single IfcPropertyTemplate can be defined within the scope of zero, one or many IfcPropertySetTemplate entities.
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IfcSimplePropertyTemplate (8)
5	TemplateType	OPTIONAL IfcSimplePropertyTemplateTypeEnum	Property type defining whether the property template defines a property with a single value, a bounded value, a list value, a table value, an enumerated value, or a reference value. Or the quantity type defining whether the template defines a quantity with a length, area, volume, weight or time value. NOTE the value of this property determines the correct use of the PrimaryUnit, SecondaryUnit, PrimaryDataType, SecondaryDataType, and Expression attributes.
6	PrimaryMeasureType	OPTIONAL IfcLabel	Primary measure type assigned to the definition of the property. It should be provided, if the TemplateType is set to: P_SINGLEVALUE: determining the measure type of IfcPropertySingleValue.NominalValue P_ENUMERATEDVALUE: determining the measure type of IfcPropertyEnumeratedValue.EnumerationValues P_BOUNDEDVALUE: determining the measure type of IfcPropertyBoundedValue.LowerBoundValue P_LISTVALUE: determining the measure type of IfcPropertyListValue.ListValues P_TABLEVALUE: determining the measure type of IfcPropertyTableValue.DefiningValues P_REFERENCEVALUE: determining the measure type of IfcPropertyTableValue.PropertyReference NOTE The value range of the measure type is within the select type IfcValue for all TemplateType's with the exception of P_REFERENCEVALUE. Here it is within the select type IfcObjectReferenceSelect.
7	SecondaryMeasureType	OPTIONAL IfcLabel	Secondary measure type assigned to the definition of the property. It should be provided, if the TemplateType is set to: P_BOUNDEDVALUE: determining the measure type of IfcPropertyBoundedValue.UpperBoundValue P_TABLEVALUE: determining the measure type of IfcPropertyTableValue.DefinedValues The value range of the measure type is within the select type IfcValue for all TemplateType's with the exception of P_ENUMERATEDVALUE. Here it is the comma delimited list of enumerators. NOTE The measure type of IfcPropertyEnumeration.EnumerationValues is provided as PrimaryDataType.
8	Enumerators	OPTIONAL IfcPropertyEnumeration	Name of the property enumeration, and list of all valid enumerators being selectable values, assigned to the definition of the property. This attribute shall only be provided, if the TemplateType is set to: P_ENUMERATEDVALUE
9	PrimaryUnit	OPTIONAL IfcUnit	Primary unit assigned to the definition of the property. It should be provided, if the TemplateType is set to: P_SINGLEVALUE: determining the IfcPropertySingleValue.Unit P_ENUMERATEDVALUE: determining the IfcPropertyEnumeration.Unit P_BOUNDEDVALUE: determining the IfcPropertyBoundedValue.Unit P_LISTVALUE: determining the IfcPropertyListValue.Unit P_TABLEVALUE: determining the IfcPropertyTableValue.DefiningUnit
10	SecondaryUnit	OPTIONAL IfcUnit	Secondary unit assigned to the definition of the property. It should be provided, if the TemplateType is set to: P_TABLEVALUE: determining the IfcPropertyTableValue.DefinedUnit
11	Expression	OPTIONAL IfcLabel	The expression used to store additional information for the property template depending on the TemplateType. It should provide the following definitions, if the TemplateType is set to: P_TABLEVALUE: the expression that could be evaluated to define the correlation between the defining values and the defined values. Q_LENGTH, Q_AREA, Q_VOLUME, Q_COUNT, Q_WEIGTH, Q_TIME: the formula to be used to calculate the quantity NOTE No value shall be asserted if the TemplateType is not listed above.
12	AccessState	OPTIONAL IfcStateEnum	Information about the access state of the property. It determines whether a property can be viewed and/or modified by any receiving application without specific knowledge of it. Attribute use definition for IfcStateEnum READWRITE: Properties of this template are readable and writable. They may be viewed and modified by users of any application. These are typical informational properties set by a user. READONLY: Properties of this template are read-only. They may be viewed but not modified by users of any application. (Applications may generate such values). These are typical automatically generated properties that should be displayed only, but not written back. LOCKED: Properties of this template are locked. They may only be accessed by the owning application (the publisher of the property set template). These are typically application dependent, internal properties that should not be published. READWRITELOCKED: Properties of this template are locked, readable, and writable. They may only be accessed by the owning application. READONLYLOCKED: Properties of this template are locked and read-only. They may only be accessed by the owning application.

Table 5.1.3.45.B

5.1.3.45.4 Concept usage

Concept	Usage	Description
IfcRoot (2)
Revision Control	General	Ownership, history, and merge state is captured using IfcOwnerHistory.
Software Identity	General	IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.
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Table 5.1.3.45.C

5.1.3.45.5 Formal representation

ENTITY IfcSimplePropertyTemplate
 SUBTYPE OF (IfcPropertyTemplate);
	TemplateType : OPTIONAL IfcSimplePropertyTemplateTypeEnum;
	PrimaryMeasureType : OPTIONAL IfcLabel;
	SecondaryMeasureType : OPTIONAL IfcLabel;
	Enumerators : OPTIONAL IfcPropertyEnumeration;
	PrimaryUnit : OPTIONAL IfcUnit;
	SecondaryUnit : OPTIONAL IfcUnit;
	Expression : OPTIONAL IfcLabel;
	AccessState : OPTIONAL IfcStateEnum;
END_ENTITY;

5.1.3.45.6 References

IfcPropertyTemplate