5.4.3.12 IfcElementAssemblyType

Type d'assemblage d'éléments
zusammengesetztes Element - Typ

The IfcElementAssemblyType defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type).

NOTE  The product representations are defined as representation maps (at the level of the supertype IfcTypeProduct, which gets assigned by an element occurrence instance through the IfcShapeRepresentation.Item[1] being an IfcMappedItem.

An element assembly type is used to define the common properties of a certain type of an element assembly that may be applied to many instances of that type to assign a specific style. An element assembly types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences.

The occurrences of the IfcElementAssemblyType are represented by instances of IfcElementAssembly.

HISTORY  New entity in IFC4.

XSD Specification:

 <xs:element name="IfcElementAssemblyType" type="ifc:IfcElementAssemblyType" substitutionGroup="ifc:IfcElementType" nillable="true"/>
 <xs:complexType name="IfcElementAssemblyType">
  <xs:complexContent>
   <xs:extension base="ifc:IfcElementType">
    <xs:attribute name="PredefinedType" type="ifc:IfcElementAssemblyTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcElementAssemblyType
SUBTYPE OF IfcElementType;
PredefinedType : IfcElementAssemblyTypeEnum;
WHERE
CorrectPredefinedType : (PredefinedType <> IfcElementAssemblyTypeEnum.USERDEFINED) OR ((PredefinedType = IfcElementAssemblyTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : Predefined types to define the particular type of the transport element. There may be property set definitions available for each predefined type.

Formal Propositions:

CorrectPredefinedType : The inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.

Inheritance Graph:

ENTITY IfcElementAssemblyType
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcTypeObject
ApplicableOccurrence : OPTIONAL IfcIdentifier;
HasPropertySets : OPTIONAL SET [1:?] OF IfcPropertySetDefinition;
INVERSE
Types : SET [0:1] OF IfcRelDefinesByType FOR RelatingType;
ENTITY IfcTypeProduct
RepresentationMaps : OPTIONAL LIST [1:?] OF UNIQUE IfcRepresentationMap;
Tag : OPTIONAL IfcLabel;
INVERSE
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElementType
ElementType : OPTIONAL IfcLabel;
ENTITY IfcElementAssemblyType
PredefinedType : IfcElementAssemblyTypeEnum;
END_ENTITY;

Link to this page  Link to this page