IfcRailingType

Natural language names
deGeländer - Typ
enRailing Type
frType de garde corps
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcRailingType
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      ApplicableOccurrenceMODIFIEDType changed from IfcLabel to IfcIdentifier.
Semantic definitions at the entity
Entity definition

The building element type IfcRailingType defines commonly shared information for occurrences of railings. The set of shared information may include:

It is used to define a railing type specification indicating the specific product information that is common to all occurrences of that product type. The IfcRailingType may be declared within IfcProject or IfcProjectLibrary using IfcRelDeclares and may be exchanged with or without occurrences of the type. Occurrences of IfcRailingType are represented by instances of IfcRailing. Refer to the documentation at IfcRailing for supported property sets, materials, and composition.

HISTORY  New entity in IFC2x2.
Attribute definitions
#AttributeTypeCardinalityDescription B
10PredefinedTypeIfcRailingTypeEnum[1:1] Identifies the predefined types of a railing element from which the type required may be set.X
Formal Propositions
RuleDescription
CorrectPredefinedTypeThe inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.
Inherited definitions from supertypes
Entity inheritance IfcBuildingElementType IfcElementType IfcTypeProduct IfcTypeObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionB
IfcRoot
1GlobalIdIfcGloballyUniqueId[1:1] Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory[0:1] 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.
X
3NameIfcLabel[0:1] 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[0:1] 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).
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). 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.
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). 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). 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
IfcTypeObject
5ApplicableOccurrence- This attribute is out of scope for this model view definition and shall not be set.
6HasPropertySetsIfcPropertySetDefinitionS[1:?] Set list of unique property sets, that are associated with the object type and are common to all object occurrences referring to this object type. X
TypesIfcRelDefinesByType
@RelatingType		S[0:1]Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type.
IfcTypeProduct
7RepresentationMapsIfcRepresentationMap~L[1:?] List of unique representation maps. Each representation map describes a block definition of the shape of the product style. By providing more than one representation map, a multi-view block definition can be given.X
8Tag- This attribute is out of scope for this model view definition and shall not be set.
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 type.
IfcElementType
9ElementType- This attribute is out of scope for this model view definition and shall not be set.
IfcBuildingElementType
IfcRailingType
10PredefinedTypeIfcRailingTypeEnum[1:1] Identifies the predefined types of a railing element from which the type required may be set.X
Definitions applying to Bridge View

 Instance diagram

This entity may be used to model re-usable parametric railing types

Railings or barriers that be defined by a constant cross section may define a material profile set which is swept along a curve.

Railings consisting of posts, rails, and spindles may define components

Bridge example

Figure 65 — Bridge railing components
Concept usage

Material Profile Set

The Material Profile Set concept applies to this entity.

Exchange
Import O O
Export O O


Type Element Aggregation

The Type Element Aggregation concept applies to this entity as shown in Table 48.

PredefinedTypeRelatedObjectsDescription
 IfcMemberPosts, rails, or spindles of explicit shape with optional explicit parametric constraints.
 IfcMemberStandardCasePosts, rails, or spindles of implicit shape based on material profile.

Table 48 — IfcRailingType Type Element Aggregation

Exchange
Import O O
Export O O


Type Body CSG Geometry

The Type Body CSG Geometry concept applies to this entity.

Railings may make use of CSG geometry such as pyramids or cones for top caps.

Exchange
Import O
Export O


Concept inheritance

#ConceptModel View
IfcRoot
Software IdentityBridge View
User IdentityBridge View
Object OwnershipBridge View
IfcTypeObject
Property Sets for TypesBridge View
IfcRailingType
Material Profile SetBridge View
Type Element AggregationBridge View
Type Body CSG GeometryBridge View
Formal representations
XSD Specification
 <xs:element name="IfcRailingType" type="ifc:IfcRailingType" substitutionGroup="ifc:IfcBuildingElementType" nillable="true"/>
 <xs:complexType name="IfcRailingType">
  <xs:complexContent>
   <xs:extension base="ifc:IfcBuildingElementType">
    <xs:attribute name="PredefinedType" type="ifc:IfcRailingTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRailingType
 SUBTYPE OF (IfcBuildingElementType);
  PredefinedType : IfcRailingTypeEnum;
 WHERE
  CorrectPredefinedType : (PredefinedType <> IfcRailingTypeEnum.USERDEFINED) OR ((PredefinedType = IfcRailingTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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