IFC 4.3.0.1 (IFC4X3_TC1)

5.1.3.34 IfcRelDeclares

5.1.3.34.1 Semantic definition

The objectified relationship IfcRelDeclares handles the declaration of objects (subtypes of IfcObject) or properties (subtypes of IfcPropertyDefinition) to a project or project library (represented by IfcProject, or IfcProjectLibrary).

The relationship handles the assignment of other objects, like IfcActor, or IfcTypeObject to the project, or project library. The attribute RelatedDefinitions provides the references to the first level objects, that are the elements within the context. All other objects that relate to the first level objects are also defined in the context.

The RelatingContext is the project, or project library that comprises all elements. The unit assignments and the presentation contexts defined at IfcProject or IfcProjectLibrary apply to all these elements.

5.1.3.34.2 Entity inheritance

5.1.3.34.3 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,

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.

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IfcRelDeclares (2)
5 RelatingContext IfcContext

Reference to the IfcProject to which additional information is assigned.

6 RelatedDefinitions SET [1:?] OF IfcDefinitionSelect

Set of object or property definitions that are assigned to a context and to which the unit and representation context definitions of that context apply.

Table 5.1.3.34.A

5.1.3.34.4 Formal propositions

Name Description
NoSelfReference

The instance to with the relation points shall not be contained in the set of RelatedObjects.

SIZEOF(QUERY(Temp <* RelatedDefinitions | RelatingContext :=: Temp)) = 0
Table 5.1.3.34.B

5.1.3.34.5 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.

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Table 5.1.3.34.C

5.1.3.34.6 Formal representation

ENTITY IfcRelDeclares
 SUBTYPE OF (IfcRelationship);
	RelatingContext : IfcContext;
	RelatedDefinitions : SET [1:?] OF IfcDefinitionSelect;
 WHERE
	NoSelfReference : SIZEOF(QUERY(Temp <* RelatedDefinitions | RelatingContext :=: Temp)) = 0;
END_ENTITY;

5.1.3.34.7 References

5.1.3.34.8 Changelog

5.1.3.34.8.1 IFC4

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