5.4.3.55 IfcRelPositions

AbV ⓘ

5.4.3.55.1 Semantic definition

An IfcRelPositions relationship informs on the positioning dependency between a product and a positioning element.

This relationship does not affect the geometric representation of a product nor its geometrical placement, which is done through subtypes of IfcObjectPlacement.

5.4.3.55.2 Entity inheritance

5.4.3.55.3 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.
Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcRelPositions (2)
5	RelatingPositioningElement	IfcPositioningElement	Positioning element defining the source of the relative position.
6	RelatedProducts	SET [1:?] OF IfcProduct	Relatively positioned product.

Table 5.4.3.55.B

5.4.3.55.4 Formal propositions

Name	Description
NoSelfReference	The instance of the PositionedElement shall not be the same instance as the Product.
`SIZEOF(QUERY(temp <* RelatedProducts \| RelatingPositioningElement :=: temp)) = 0`

Table 5.4.3.55.C

5.4.3.55.5 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 5.4.3.55.D

5.4.3.55.6 Examples

Figure 5.4.3.55.A

Linear Placement Of Signal

5.4.3.55.7 Formal representation

ENTITY IfcRelPositions
 SUBTYPE OF (IfcRelConnects);
	RelatingPositioningElement : IfcPositioningElement;
	RelatedProducts : SET [1:?] OF IfcProduct;
 WHERE
	NoSelfReference : SIZEOF(QUERY(temp <* RelatedProducts | RelatingPositioningElement :=: temp)) = 0;
END_ENTITY;