IfcRelProjectsElement

Natural language names
Hinzufügen / Addition von Teil zu Element - Relation
Rel Projects Element
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcRelProjectsElement
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
IFC4 Addendum 2 4.0.2.0
    IfcRelProjectsElement
      RelatingElementXMODIFIEDXsdformat changed from Attribute to Hidden.
Semantic definitions at the entity
Entity definition

The IfcRelProjectsElement is an objectified relationship between an element and one projection element that creates a modifier to the shape of the element. The relationship is defined to be a 1:1 relationship, if an element has more than one projection, several relationship objects have to be used, each pointing to a different projection element. The IfcRelProjectsElement establishes an aggregation relationship between the main element and a sub ordinary addition feature.

NOTE  In contrary the IfcRelAggregates relationship established an aggregation of equal parts to a whole.

The IfcRelProjectsElement implies a Boolean operation of addition for the geometric bodies of the element and the feature element. As with all decomposition relationships it determines:

HISTORY  New entity in IFC2x2.

IFC4 CHANGE  Supertype changed to IfcRelDecomposes.

Attribute definitions
#AttributeTypeCardinalityDescription G
5RelatingElementIfcElement Element at which a projection is created by the associated IfcProjectionElement. X
6RelatedFeatureElementIfcFeatureElementAddition Reference to the IfcFeatureElementAddition that defines an addition to the volume of the element, by using a Boolean addition operation. An example is a projection at the associated element. X
Inherited definitions from supertypes
Entity inheritance IfcRelDecomposes 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
IfcRelDecomposes
IfcRelProjectsElement
5RelatingElementIfcElement Element at which a projection is created by the associated IfcProjectionElement. X
6RelatedFeatureElementIfcFeatureElementAddition Reference to the IfcFeatureElementAddition that defines an addition to the volume of the element, by using a Boolean addition operation. An example is a projection at the associated element. 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="IfcRelProjectsElement" type="ifc:IfcRelProjectsElement" substitutionGroup="ifc:IfcRelDecomposes" nillable="true"/>
 <xs:complexType name="IfcRelProjectsElement">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelDecomposes">
    <xs:sequence>
     <xs:element name="RelatedFeatureElement" type="ifc:IfcFeatureElementAddition" nillable="true"/>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelProjectsElement
 SUBTYPE OF (IfcRelDecomposes);
  RelatingElement : IfcElement;
  RelatedFeatureElement : IfcFeatureElementAddition;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcElement IfcFeatureElementAddition

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