IfcRelPositions

Natural language names
Change log
ItemSPFXMLChangeDescription
IFC4x2 DRAFT 1
    IfcRelPositionsADDED
Semantic definitions at the entity
Entity definition

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

Attribute definitions
#AttributeTypeCardinalityDescription G
5RelatingPositioningElementIfcPositioningElement Positioning element defining the source of the relative position.X
6RelatedProductsIfcProductS[1:?] Relatively positioned product.X
Formal Propositions
RuleDescription
NoSelfReferenceThe instance of the PositionedElement shall not be the same instance as the Product.
Inherited definitions from supertypes
Entity inheritance IfcRelConnects IfcRelationship IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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
3NameIfcLabel? 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
4DescriptionIfcText? Optional description, provided for exchanging informative comments.X
IfcRelationship
IfcRelConnects
IfcRelPositions
5RelatingPositioningElementIfcPositioningElement Positioning element defining the source of the relative position.X
6RelatedProductsIfcProductS[1:?] Relatively positioned product.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcProduct IfcPositioningElement

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