IfcBridge

Natural language names
Bridge
Change log
ItemSPFXMLChangeDescription
IFC4x2 Candidate 4.2.0.0
    IfcBridgeADDED
IFC4x2 to IFC4x3_RC1
    IfcBridge
      ReferencedInStructuresADDED
IFC4x3_RC4 Update
    IfcBridge
      IsInterferedByElementsADDED
      InterferesElementsADDED
Semantic definitions at the entity
Entity definition

A Bridge is civil engineering works that affords passage to pedestrians, animals, vehicles, and services above obstacles or between two points at a height above ground.

NOTE  Definition from [ISO 6707-1:2014:
Civil engineering works that affords passage to pedestrians, animals, vehicles, and services above obstacles or between two points at a height above ground.

Attribute definitions
#AttributeTypeCardinalityDescription G
10PredefinedTypeIfcBridgeTypeEnum? A list of types to further identify the object. Some property sets may be specifically applicable to one of these types.
NOTE  If the object has an associated IfcTypeObject with a PredefinedType, then this attribute shall not be used.
X
Formal Propositions
RuleDescription
CorrectPredefinedTypeEither PredefinedType is unset or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED or PredefinedType.
Inherited definitions from supertypes
Entity inheritance IfcFacility IfcSpatialStructureElement IfcSpatialElement IfcProduct IfcObject IfcObjectDefinition 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
IfcObjectDefinition
HasAssignmentsIfcRelAssigns
@RelatedObjects
S[0:?]Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups. X
NestsIfcRelNests
@RelatedObjects
S[0:1]References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.
X
IsNestedByIfcRelNests
@RelatingObject
S[0:?]References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.
X
HasContextIfcRelDeclares
@RelatedDefinitions
S[0:1]References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.
IFC4 CHANGE  The inverse attribute datatype has been added.
X
IsDecomposedByIfcRelAggregates
@RelatingObject
S[0:?]References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
DecomposesIfcRelAggregates
@RelatedObjects
S[0:1]References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
HasAssociationsIfcRelAssociates
@RelatedObjects
S[0:?]Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification. X
IfcObject
5ObjectTypeIfcLabel? The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED. X
IsDeclaredByIfcRelDefinesByObject
@RelatedObjects
S[0:1]Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
X
DeclaresIfcRelDefinesByObject
@RelatingObject
S[0:?]Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
X
IsTypedByIfcRelDefinesByType
@RelatedObjects
S[0:1]Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.
IFC4 CHANGE  New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange.
X
IsDefinedByIfcRelDefinesByProperties
@RelatedObjects
S[0:?]Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.
IFC4 CHANGE  The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.
X
IfcProduct
6ObjectPlacementIfcObjectPlacement? Placement of the product in space, the placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system. X
7RepresentationIfcProductRepresentation? Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement. X
ReferencedByIfcRelAssignsToProduct
@RelatingProduct
S[0:?]Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product. X
PositionedRelativeToIfcRelPositions
@RelatedProducts
S[0:?]X
ReferencedInStructuresIfcRelReferencedInSpatialStructure
@RelatedElements
S[0:?]X
IfcSpatialElement
8LongNameIfcLabel? Long name for a spatial structure element, used for informal purposes. It should be used, if available, in conjunction with the inherited Name attribute.
NOTE  In many scenarios the Name attribute refers to the short name or number of a spacial element, and the LongName refers to the full descriptive name.
X
ContainsElementsIfcRelContainedInSpatialStructure
@RelatingStructure
S[0:?]Set of spatial containment relationships, that holds those elements, which are contained within this element of the project spatial structure.
NOTE  The spatial containment relationship, established by IfcRelContainedInSpatialStructure, is required to be an hierarchical relationship, where each element can only be assigned to 0 or 1 spatial structure element.
X
ServicedBySystemsIfcRelServicesBuildings
@RelatedBuildings
S[0:?]Set of relationships to systems, that provides a certain service to the spatial element for which it is defined. The relationship is handled by the objectified relationship IfcRelServicesBuildings.
IFC4 CHANGE  The inverse attribute has been promoted to the new supertype IfcSpatialElement with upward compatibility for file based exchange.
X
ReferencesElementsIfcRelReferencedInSpatialStructure
@RelatingStructure
S[0:?]Set of spatial reference relationships, that holds those elements, which are referenced, but not contained, within this element of the project spatial structure.
NOTE  The spatial reference relationship, established by IfcRelReferencedInSpatialStructure, is not required to be an hierarchical relationship, i.e. each element can be assigned to 0, 1 or many spatial structure elements.
EXAMPLE  A curtain wall maybe contained in the ground floor, but maybe referenced in all floors, it reaches.
IFC2x3 CHANGE  The inverse attribute has been added with upward compatibility for file based exchange.
Ø\X
X
IsInterferedByElementsIfcRelInterferesElements
@RelatedElement
S[0:?]Reference to the interference relationship to indicate the spatial element that is interfered. The relationship, if provided, indicates that this spatial element has an interference with one or many other spatial elements.
NOTE  There is no indication of precedence between IsInterferedByElements and InterferesElements orientated interference is defined by IfcRelInterferesElements.ImpliedOrder or IfcRelInterferesElements.InterferenceType.
IFC4x3 CHANGE New inverse relationship.
X
InterferesElementsIfcRelInterferesElements
@RelatingElement
S[0:?]Reference to the interference relationship to indicate the spatial element that interferes. The relationship, if provided, indicates that this spatial element has an interference with one or many other spatial elements.
NOTE  There is no indication of precedence between IsInterferedByElements and InterferesElements. Orientated interference is defined by IfcRelInterferesElements.ImpliedOrder or IfcRelInterferesElements.InterferenceType.
IFC4x3 CHANGE New inverse relationship.
X
IfcSpatialStructureElement
9CompositionTypeIfcElementCompositionEnum? Denotes, whether the predefined spatial structure element represents itself, or an aggregate (complex) or a part (part). The interpretation is given separately for each subtype of spatial structure element. If no CompositionType is asserted, the dafault value ''ELEMENT'' applies.\X\0D \X\0D
IFC4 CHANGE  Attribute made optional.
X
IfcFacility
IfcBridge
10PredefinedTypeIfcBridgeTypeEnum? A list of types to further identify the object. Some property sets may be specifically applicable to one of these types.
NOTE  If the object has an associated IfcTypeObject with a PredefinedType, then this attribute shall not be used.
X
Definitions applying to General Usage

 Instance diagram


IfcBridge
Concept usage

Spatial Composition

The Spatial Composition concept template applies to this entity as shown in Table 56.

RelatingObjectDescription
IfcProjectDirect assignment to project, if the bridgeis the outermost spatial container, and no site information is provided for bridge projects
IfcSiteAssignment to site, if the bridge is the spatial container for the bridge project with site information
IfcBridgeAssignment to another bridge as spatial container, e.g. if this bridge represents a bridge section.

Table 56 — IfcBridge Spatial Composition

NOTE  By using the inverse relationship IfcBridge.Decomposes it references IfcProject || IfcSite || IfcBridge through IfcRelAggregates.RelatingObject. If it refers to another instance of IfcBridge, the referenced IfcBridge needs to have a different and higher CompositionType, i.e. COMPLEX (if the other IfcBuilding has ELEMENT), or ELEMENT (if the other IfcBridge has PARTIAL).



Spatial Decomposition

The Spatial Decomposition concept template applies to this entity as shown in Table 57.

RelatedObjectsDescription
IfcBridgePartSpatial decomposition into bridge parts
IfcBridgeSpatial decomposition into other bridges, e.g. if this bridge represents a complex bridge that is subdivided into bridge sections.

Table 57 — IfcBridge Spatial Decomposition

NOTE  By using the inverse relationship IfcBridge.IsDecomposedBy it references IfcBridge || IfcBridgePart through IfcRelAggregates.RelatedObjects. If it refers to another instance of IfcBridge, the referenced IfcBridge needs to have a different and lower CompositionType, i.e. ELEMENT (if the other IfcBridge has COMPLEX), or PARTIAL (if the other IfcBridge has ELEMENT).



Spatial Container

The Spatial Container concept template applies to this entity as shown in Table 58.

TypeDescription
IfcElementPhysical elements that are directly related to the building.
IfcAnnotationAnnotations that are directly related to the building.
IfcPositioningElementPositioning elements that are directly related to the building.

Table 58 — IfcBridge Spatial Container

NOTE  If there are building elements and/or other elements directly related to the IfcBridge, they are associated with the IfcBridge by using the objectified relationship IfcRelContainedInSpatialStructure. The IfcBridge references them by its inverse relationship: > * IfcBridge.ContainsElements -- referencing any subtype of IfcProduct (with the exception of other spatial structure element) by IfcRelContainedInSpatialStructure.RelatedElements.



Bridge Systems

The Spatial Service Connectivity concept applies to this entity.



Property Sets for Objects

The Property Sets for Objects concept template applies to this entity as shown in Table 59.

PsetNameProperties
Pset_BridgeCommon

Table 59 — IfcBridge Property Sets for Objects



Object Predefined Type

The Object Predefined Type concept applies to this entity.



Placement

The Product Local Placement concept applies to this entity.

The local placement for IfcBridge is defined in its supertype IfcProduct. It is defined by IfcLocalPlacement or by IfcLinearPlacement>/em> which defines the local coordinate system that is referenced by all geometric representations.



Property Sets for Objects

The Property Sets for Objects concept template applies to this entity as shown in Table 60.

PsetNameProperties
Pset_BridgeCommon

Table 60 — IfcBridge Property Sets for Objects



Body Geometry

The Body Geometry concept applies to this entity.

The body (or solid model) geometric representation (if the bridge has an independent geometric representation) of IfcBridge is defined using faceted B-Rep capabilities (with or without voids), based on the IfcFacetedBrep or on the IfcFacetedBrepWithVoids. In the case of alignment based infrastructure, the geometric representation can be defined using IfcSectionedSolidHorizontal optionally IfcSweptAreaSolid.

NOTE  Since the bridge shape is usually described by the exterior building elements, an independent shape representation shall only be given, if the bridge is exposed independently from its constituting elements and such independent geometric representation may be prohibited in model view definitions.



mvdXML Specification
<?xml version="1.0" encoding="utf-8"?>
<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" uuid="e8c0bfaf-4cde-48ed-9e9d-8ec9dfd545d6" name="IfcBridge" applicableRootEntity="IfcBridge">
 <Applicability>
  <Template ref="4837f640-862c-45ec-beeb-f094503b7675" />
  <TemplateRules operator="and">
  </TemplateRules>
 </Applicability>
 <Concepts>
  <Concept uuid="f0960974-7334-4908-8a41-c6b4c9c42823" name="Spatial Composition">
   <Template ref="8c0fd2f7-71bb-4e6e-8fdb-0c02b352f14a" />
   <TemplateRules operator="and">
    <TemplateRule Description="Direct assignment to project, if the bridgeis the outermost spatial container, and no site information is provided for bridge projects" Parameters="RelatingObject[Type]=&apos;IfcProject&apos;" />
    <TemplateRule Description="Assignment to site, if the bridge is the spatial container for the bridge project with site information" Parameters="RelatingObject[Type]=&apos;IfcSite&apos;" />
    <TemplateRule Description="Assignment to another bridge as spatial container, e.g. if this bridge represents a bridge section." Parameters="RelatingObject[Type]=&apos;IfcBridge&apos;" />
   </TemplateRules>
  </Concept>
  <Concept uuid="db6d560c-a589-4136-830a-3c441d03c4db" name="Spatial Decomposition">
   <Template ref="667f8443-ecce-4a8d-a63f-931fab0453e0" />
   <TemplateRules operator="and">
    <TemplateRule Description="Spatial decomposition into bridge parts" Parameters="RelatedObjects[Type]=&apos;IfcBridgePart&apos;" />
    <TemplateRule Description="Spatial decomposition into other bridges, e.g. if this bridge represents a complex bridge that is subdivided into bridge sections." Parameters="RelatedObjects[Type]=&apos;IfcBridge&apos;" />
   </TemplateRules>
  </Concept>
  <Concept uuid="cdd0bb13-3af9-4a0e-a248-f1e4be0740a6" name="Spatial Container">
   <Template ref="61dd08ed-fd01-4955-9337-8afd284a0e6f" />
   <TemplateRules operator="and">
    <TemplateRule Description="Physical elements that are directly related to the building." Parameters="Type[Type]=&apos;IfcElement&apos;" />
    <TemplateRule Description="Annotations that are directly related to the building." Parameters="Type[Type]=&apos;IfcAnnotation&apos;" />
    <TemplateRule Description="Positioning elements that are directly related to the building." Parameters="Type[Type]=&apos;IfcPositioningElement&apos;" />
   </TemplateRules>
  </Concept>
  <Concept uuid="dded3474-9d58-4fcf-b327-8cca487db8e4" name="Bridge Systems">
   <Template ref="e3461692-f4c5-4dfa-a8f5-0734a0698f6b" />
  </Concept>
  <Concept uuid="6aaae57d-4e90-4db8-ae75-5d5762f907c4" name="Property Sets for Objects">
   <Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
   <TemplateRules operator="and">
    <TemplateRule Parameters="PsetName[Value]=&apos;Pset_BridgeCommon&apos;" />
   </TemplateRules>
  </Concept>
  <Concept uuid="79ae4bac-1c99-4604-9ee0-11b0595f3300" name="Object Predefined Type">
   <Template ref="25248261-98df-4d0a-9364-5653575ca421" />
  </Concept>
  <Concept uuid="05e2825a-c732-454c-a524-964f19fc6da4" name="Placement">
   <Template ref="cbe85b5f-7912-4a43-8bb7-1e63bf40b26d" />
  </Concept>
  <Concept uuid="e061cc9c-d307-498d-88fa-a97891a04d96" name="Property Sets for Objects">
   <Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
   <TemplateRules operator="and">
    <TemplateRule Parameters="PsetName[Value]=&apos;Pset_BridgeCommon&apos;" />
   </TemplateRules>
  </Concept>
  <Concept uuid="87d81bba-c697-4817-9825-72bb22ce3b69" name="Body Geometry">
   <Template ref="c446bd16-2de3-4b97-b34f-4446ac0badc2" />
  </Concept>
 </Concepts>
</ConceptRoot>
Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
IfcObjectDefinition
Classification AssociationClassification AssociationGeneral Usage
Assignment to ProductAssignment to ProductGeneral Usage
IfcObject
Object User IdentityObject User IdentityGeneral Usage
Object TypingObject TypingGeneral Usage
Property Sets with OverrideProperty Sets with OverrideGeneral Usage
IfcProduct
Product PlacementProduct PlacementGeneral Usage
Product Geometric RepresentationProduct Geometric RepresentationGeneral Usage
Relative PositionProduct Relative PositioningGeneral Usage
Product Span PositioningProduct Span PositioningGeneral Usage
Product Geometry ColourProduct Geometry ColourGeneral Usage
Product Geometry LayerProduct Geometry LayerGeneral Usage
Product Relative PlacementProduct Relative PlacementGeneral Usage
IfcSpatialElement
FootPrint GeomSet GeometryFootPrint GeomSet GeometryGeneral Usage
Group Spatial ConnectivityGroup Spatial ConnectivityGeneral Usage
Spatial InterferenceSpatial InterferenceGeneral Usage
Spatial Interference with ZonesSpatial Interference With ZonesGeneral Usage
IfcBridge
Spatial CompositionSpatial CompositionGeneral Usage
Spatial DecompositionSpatial DecompositionGeneral Usage
Spatial ContainerSpatial ContainerGeneral Usage
Bridge SystemsSpatial Service ConnectivityGeneral Usage
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Object Predefined TypeObject Predefined TypeGeneral Usage
PlacementProduct Local PlacementGeneral Usage
Body GeometryBody GeometryGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcBridge" type="ifc:IfcBridge" substitutionGroup="ifc:IfcFacility" nillable="true"/>
 <xs:complexType name="IfcBridge">
  <xs:complexContent>
   <xs:extension base="ifc:IfcFacility">
    <xs:attribute name="PredefinedType" type="ifc:IfcBridgeTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcBridge
 SUBTYPE OF (IfcFacility);
  PredefinedType : OPTIONAL IfcBridgeTypeEnum;
 WHERE
  CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcBridgeTypeEnum.USERDEFINED) OR
((PredefinedType = IfcBridgeTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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