Elément géographique
Geographisches Objekt

An IfcGeographicElement is a generalization of all elements within a geographical landscape. It includes occurrences of typical geographical element, often referred to as features, such as roads, zones, trees, etc. Common type information behind several occurrences of IfcGeographicElement is provided by the IfcGeographicElementType.

HISTORY  New entity in IFC4.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 50.

Table 50 — IfcGeographicElement Object Typing

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 51.

Table 51 — IfcGeographicElement Property Sets for Objects

Object Classification

The Object Classification concept applies to this entity.

An IfcGeographicElement might be further qualified by referencing a feature catalog as a particular classification. The feature classification is assigned using the inverse relationship HasAssociations pointing to IfcClassificationReference. The attributes should have the following meaning:

Spatial Containment

The Spatial Containment concept applies to this entity as shown in Table 52.
IfcSiteAssignment to a site within a building project context
IfcSpatialZoneAssignment to any spatial structure

Table 52 — IfcGeographicElement Spatial Containment

XSD Specification:

 <xs:element name="IfcGeographicElement" type="ifc:IfcGeographicElement" substitutionGroup="ifc:IfcElement" nillable="true"/>
 <xs:complexType name="IfcGeographicElement">
   <xs:extension base="ifc:IfcElement">
    <xs:attribute name="PredefinedType" type="ifc:IfcGeographicElementTypeEnum" use="optional"/>

EXPRESS Specification:

ENTITY IfcGeographicElement
SUBTYPE OF IfcElement;
PredefinedType : OPTIONAL IfcGeographicElementTypeEnum;
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcGeographicElementTypeEnum.USERDEFINED) OR ((PredefinedType = IfcGeographicElementTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : Predefined generic types for a geographic element that are specified in an enumeration. There might be property sets defined specifically for each predefined type.

Formal Propositions:

CorrectPredefinedType : Either the IfcGeographicElement attribute is unset (e.g. because an IfcGeographicElementType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : Either there is no geographic element type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcGeographicElementType.

Inheritance Graph:

ENTITY IfcGeographicElement
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
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 IfcObject
ObjectType : OPTIONAL IfcLabel;
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties FOR RelatedObjects;
ENTITY IfcProduct
ObjectPlacement : OPTIONAL IfcObjectPlacement;
Representation : OPTIONAL IfcProductRepresentation;
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo : SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasOpenings : SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization : SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries : SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom : SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcGeographicElement
PredefinedType : OPTIONAL IfcGeographicElementTypeEnum;

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