5.1.3.16 IfcPropertySetTemplate

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5.1.3.16.1 Semantic definition

IfcPropertySetTemplate defines the template for all dynamically extensible property sets represented by IfcPropertySet. The property set template is a container of property templates within a property tree. The individual property templates are interpreted according to their Name attribute and shall have no values assigned.

Property set templates can form part of a property library used and declared within a project. Depending on the TemplateType the IfcPropertySetTemplate defines a template for:

"Pset_" - occurrences of IfcPropertySet
"Qto_" - occurrences of IfcElementQuantity

The inherited HasContext inverse relation to IfcRelDeclares is used to declare the IfcPropertySetTemplate within a project library. If included in an exchange data set it can then be traversed through the IfcProjectLibrary. The Defines inverse relation to IfcRelDefinesByTemplate is provided to keep the definition relationship between the IfcPropertySetTemplate and the one to many IfcPropertySet's, for which it provides the template. Figure 5.1.3.16.A illustrates relationships used for property set templates.

Between IfcProperty's within the HasProperties set of IfcPropertySet having the same Name attribute value as the IfcPropertyTemplate's within the HasPropertyTemplates set of IfcPropertySetTemplate an implicit definition relationship is established that assigns the template to the individual properties.

5.1.3.16.2 Entity inheritance

5.1.3.16.3 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.
Click to show 6 hidden inherited attributes Click to hide 6 inherited attributes
IfcPropertySetTemplate (4)
5	TemplateType	OPTIONAL IfcPropertySetTemplateTypeEnum	Property set type defining whether the property set is applicable to a type (subtypes of IfcTypeObject), to an occurrence (subtypes of IfcObject), or as a special case to a performance history. The attribute ApplicableEntity may further refine the applicability to a single or multiple entity type(s).
6	ApplicableEntity	OPTIONAL IfcIdentifier	The attribute optionally defines the data type of the applicable type or occurrence object, to which the assigned property set template can relate. If not present, no instruction is given to which type or occurrence object the property set template is applicable. The following conventions are used: The IFC entity name of the applicable entity using the IFC naming convention, CamelCase with `Ifc` prefix It can be optionally followed by the predefined type after the separator "/" (forward slash), using upper case If a performance history object of a particular distribution object is attributed by the property set template, then the entity name (and potentially amended by the predefined type) is expanded by adding '[PerformanceHistory]' If one property set template is applicable to many type and/or occurrence objects, then those object names should be separate by comma "," forming a comma separated string. EXAMPLE Referring to a boiler type as applicable entity would be expressed as 'IfcBoilerType', referring to a steam boiler type as applicable entity would be expressed as 'IfcBoilerType/STEAM', referring to a wall and a wall type would be expressed as 'IfcWall, IfcWallType'. An applicable IfcPerformanceHistory assigned to an occurrence or type object would be indicated by IfcBoilerType[PerformanceHistory], or respectively IfcBoilerType/STEAM[PerformanceHistory].
7	HasPropertyTemplates	SET [1:?] OF IfcPropertyTemplate	Set of IfcPropertyTemplate's that are defined within the scope of the IfcPropertySetTemplate.
	Defines	SET [0:?] OF IfcRelDefinesByTemplate FOR RelatingTemplate	Relation to the property sets, via the objectified relationship IfcRelDefinesByTemplate, that, if given, utilize the definition template.

Table 5.1.3.16.B

5.1.3.16.4 Formal propositions

Name	Description
ExistsName	The Name attribute has to be provided. The attribute is used to specify the signifier of the property set template. The properties that are allowed to be attached to a particular property set template may be given within the property set definition part of the IFC specification.
`EXISTS(SELF\IfcRoot.Name)`
UniquePropertyNames	Every individual IfcPropertyTemplate within the property set template shall have a unique Name attribute value.
`IfcUniquePropertyTemplateNames(HasPropertyTemplates)`

Table 5.1.3.16.C

5.1.3.16.5 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.
Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts

Table 5.1.3.16.D

5.1.3.16.6 Formal representation

ENTITY IfcPropertySetTemplate
 SUBTYPE OF (IfcPropertyTemplateDefinition);
	TemplateType : OPTIONAL IfcPropertySetTemplateTypeEnum;
	ApplicableEntity : OPTIONAL IfcIdentifier;
	HasPropertyTemplates : SET [1:?] OF IfcPropertyTemplate;
 INVERSE
	Defines : SET [0:?] OF IfcRelDefinesByTemplate FOR RelatingTemplate;
 WHERE
	ExistsName : EXISTS(SELF\IfcRoot.Name);
	UniquePropertyNames : IfcUniquePropertyTemplateNames(HasPropertyTemplates);
END_ENTITY;