IFC 4.3.x development

5.1.3.18 IfcPropertyTemplateDefinition

Change log

IFC4

added

5.1.3.18.1 Semantic definitions at the entity

IfcPropertyTemplateDefinition is a generalization of all property and property set templates. Templates define the collection, types, names, applicable measure types and units of individual properties used in a project. The property template definition can be either:

  • Property set template - IfcPropertySetTemplate, a collection of property templates that determine the definition of properties used within a project context.
  • Property template - IfcPropertyTemplate, a single template that determines the definition of a particular property used in the same project context. The template may determine the name, description, data type, the unit, or a standard expression for each property that is based on that template.

The subtypes of IfcPropertyTemplateDefinition are declared within a project context. The uppermost template definition (e.g. the IfcPropertySetTemplate including several IfcPropertyTemplate's) should be related to the context, either IfcProject, or IfcProjectLibrary, using the inherited HasContext inverse attribute.

HISTORY  New entity in IFC4.

# Attribute Type Description
IfcRoot
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 in 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
HasContext SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions
HasAssociationsSET [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.

5.1.3.18.1 Entity inheritance

dot_inheritance IfcPropertySetTemplate IfcPropertySetTemplate IfcPropertyTemplateDefinition IfcPropertyTemplateDefinition IfcPropertySetTemplate->IfcPropertyTemplateDefinition IfcPropertyDefinition IfcPropertyDefinition IfcPropertyTemplateDefinition->IfcPropertyDefinition IfcPropertyTemplate IfcPropertyTemplate IfcPropertyTemplate->IfcPropertyTemplateDefinition IfcPropertySetDefinition IfcPropertySetDefinition IfcPropertySetDefinition->IfcPropertyDefinition IfcRoot IfcRoot IfcPropertyDefinition->IfcRoot IfcObjectDefinition IfcObjectDefinition IfcObjectDefinition->IfcRoot IfcRelationship IfcRelationship IfcRelationship->IfcRoot

5.1.3.18.2 Definitions applying to General Usage

5.1.3.18.2.1 Identity

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

5.1.3.18.2.2 Revision Control

Ownership, history, and merge state is captured using IfcOwnerHistory.

5.1.3.18.3 Formal representations

ENTITY IfcPropertyTemplateDefinition
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcPropertySetTemplate
	,IfcPropertyTemplate))
 SUBTYPE OF (IfcPropertyDefinition);
END_ENTITY;