IfcRelPositions

Item	SPF	XML	Change	Description
IFC4x2 Candidate 4.2.0.0
IfcRelPositions			ADDED

Semantic definitions at the entity

Entity definition

An IfcRelPositions relationship defines the relationship that positions a product related to a positioning element..

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
5	RelatingPositioningElement	IfcPositioningElement		Positioning element defining the source of the relative position.	X
6	RelatedProducts	IfcProduct	S[1:?]	Relatively positioned product.	X

Formal Propositions

Rule	Description
NoSelfReference	The instance of the PositionedElement shall not be the same instance as the Product.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRoot
1	GlobalId	IfcGloballyUniqueId		Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	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.	X
3	Name	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.	X
4	Description	IfcText	?	Optional description, provided for exchanging informative comments.	X
IfcRelationship
IfcRelConnects
IfcRelPositions
5	RelatingPositioningElement	IfcPositioningElement		Positioning element defining the source of the relative position.	X
6	RelatedProducts	IfcProduct	S[1:?]	Relatively positioned product.	X

#	Concept	Template	Model View
IfcRoot
	Identity	Software Identity	General Usage
	Revision Control	Revision Control	General Usage

Formal representations

XML Specification

 <xs:element name="IfcRelPositions" type="ifc:IfcRelPositions" substitutionGroup="ifc:IfcRelConnects" nillable="true"/>

 <xs:complexType name="IfcRelPositions">

  <xs:complexContent>

   <xs:extension base="ifc:IfcRelConnects">

    <xs:sequence>

     <xs:element name="RelatingPositioningElement" type="ifc:IfcPositioningElement" nillable="true"/>

     <xs:element name="RelatedProducts">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcProduct" maxOccurs="unbounded"/>

       </xs:sequence>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcProduct"/>

       <xs:attribute ref="ifc:cType" fixed="set"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcRelPositions

 SUBTYPE OF (IfcRelConnects);

  RelatingPositioningElement : IfcPositioningElement;

  RelatedProducts : SET [1:?] OF IfcProduct;

 WHERE

  NoSelfReference : SIZEOF(QUERY(temp <* RelatedProducts | RelatingPositioningElement :=: temp)) = 0;
END_ENTITY;

 EXPRESS-G diagram

IfcRelPositions

Semantic definitions at the entity

Inherited definitions from supertypes

Definitions applying to General Usage

Formal representations