5.1.3.34 IfcRelDeclares

RV ⓘ

AbV ⓘ

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 objects 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 objects. The unit assignments and the presentation contexts defined at IfcProject or IfcProjectLibrary apply to all these objects.

5.1.3.34.2 Entity inheritance

- IfcRoot

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. 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	An 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	An optional description, provided to exchange 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 which the relation points shall not be contained in the set of RelatedDefinitions.
`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 also provide a name and description for 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;