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  • IfcTypeObject
    a comma separated string EXAMPLE Refering to a furniture as applicable occurrence entity would be expressed as IfcFurnishingElement refering to a brace as applicable entity would be expressed as IfcMember BRACE refering to a wall and wall standard case would be expressed as IfcWall IfcWallStandardCase 6 HasPropertySets IfcPropertySetDefinition S 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 Types IfcRelDefinesByType RelatingType S 0 1 Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects which are defined by this type Formal Propositions Rule Description NameRequired A Name attribute has to be provided The name can be declared within the IFC specification as part of the property set agreements UniquePropertySetNames Inherited definitions from supertypes Attribute inheritance Attribute Type Cardinality Description IfcRoot 1 GlobalId IfcGloballyUniqueId 1 1 Assignment of a globally unique identifier within the entire software world 2 OwnerHistory IfcOwnerHistory 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 3 Name IfcLabel 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 4 Description IfcText 0 1 Optional description provided for exchanging informative comments IfcObjectDefinition HasAssignments IfcRelAssigns 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 Nests IfcRelNests 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 IsNestedBy IfcRelNests 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 HasContext IfcRelDeclares 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 IsDecomposedBy IfcRelAggregates 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 Decomposes IfcRelAggregates 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 HasAssociations IfcRelAssociates RelatedObjects S 0

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifckernel/lexical/ifctypeobject.htm (2016-02-12)
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  • IfcProject
    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 Decomposes IfcRelAggregates 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 HasAssociations IfcRelAssociates 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 IfcContext 5 ObjectType IfcLabel 0 1 The object type denotes a particular type that indicates the object further The use has to be established at the level of instantiable subtypes NOTE Subtypes of IfcContext do not introduce a PredefinedType attribute therefore the usage of ObjectType is not bound to the selection of USERDEFINED within the PredefinedType enumaration 6 LongName IfcLabel 0 1 Long name for the context as used for reference purposes 7 Phase IfcLabel 0 1 Current project phase or life cycle phase of this project Applicable values have to be agreed upon by view definitions or implementer agreements 8 RepresentationContexts IfcRepresentationContext S 1 Context of the representations used within the context When the context is a project and it includes shape representations for its components one or several geometric representation contexts need to be included that define e g the world coordinate system the coordinate space dimensions and or the precision factor 9 UnitsInContext IfcUnitAssignment 0 1 Units globally assigned to measure types used within the context IsDefinedBy IfcRelDefinesByProperties RelatedObjects S 0 Set of relationships to property set definitions attached to this context Those statically or dynamically defined properties contain alphanumeric information content that further defines the context Declares IfcRelDeclares RelatingContext S 0 Reference to the IfcRelDeclares relationship that assigns the uppermost entities of includes hierarchies to this context instance NOTE The spatial hiearchy is assigned to IfcProject using the IfcRelAggregates relationship This is a single exception due to compatibility reasons with earlier releases IfcProject Definitions applying to Common Use Definitions Instance diagram Concepts applied at the entity Spatial Decomposition The Spatial Decomposition concept applies to this entity as shown in Table 4 Spatial Parts Description IfcSite If referenced the site is the root of the spatial structure IfcBuilding If referenced the building is the root of the spatial structure no explicit site information included IfcSpatialZone If referenced the spatial zone is the root of the spatial structure to be used as a stub for non building related projects Table 4 IfcProject Spatial Decomposition The IfcProject is used to reference the root of the spatial structure of a building or other construction project that serves as the primary project breakdown and is required to be hierarchical The spatial structure elements are linked together and to the IfcProject by using the objectified relationship IfcRelAggregates The following constraints are applied to using the relationshio IfcRelAggregates in context

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifckernel/lexical/ifcproject.htm (2016-02-12)
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  • IfcRamp
    of a type or style definition that is common to all reflected instances of the declaring IfcObject or its subtypes IsTypedBy IfcRelDefinesByType 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 IsDefinedBy IfcRelDefinesByProperties 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 IfcProduct 6 ObjectPlacement IfcObjectPlacement 0 1 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 7 Representation IfcProductRepresentation 0 1 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 ReferencedBy IfcRelAssignsToProduct 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 IfcElement 8 Tag IfcIdentifier 0 1 The tag or label identifier at the particular instance of a product e g the serial number or the position number It is the identifier at the occurrence level FillsVoids IfcRelFillsElement RelatedBuildingElement S 0 1 Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element ConnectedTo IfcRelConnectsElements RelatingElement S 0 Reference to the element connection relationship The relationship then refers to the other element to which this element is connected to IsInterferedByElements IfcRelInterferesElements RelatedElement S 0 Reference to the interference relationship to indicate the element that is interfered The relationship if provided indicates that this element has an interference with one or many other elements NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements InterferesElements IfcRelInterferesElements RelatingElement S 0 Reference to the interference relationship to indicate the element that interferes The relationship if provided indicates that this element has an interference with one or many other elements NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements HasProjections IfcRelProjectsElement RelatingElement S 0 Projection relationship that adds a feature using a Boolean union to the IfcBuildingElement ReferencedInStructures IfcRelReferencedInSpatialStructure RelatedElements S 0 Reference relationship to the spatial structure element to which the element is additionally associated This relationship may not be hierarchical an element may be referenced by zero one or many spatial structure elements HasOpenings IfcRelVoidsElement RelatingBuildingElement S 0 Reference to the IfcRelVoidsElement relationship that creates an opening in an element An

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcsharedbldgelements/lexical/ifcramp.htm (2016-02-12)
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  • IfcRoof
    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 Declares IfcRelDefinesByObject 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 IsTypedBy IfcRelDefinesByType 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 IsDefinedBy IfcRelDefinesByProperties 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 IfcProduct 6 ObjectPlacement IfcObjectPlacement 0 1 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 7 Representation IfcProductRepresentation 0 1 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 ReferencedBy IfcRelAssignsToProduct 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 IfcElement 8 Tag IfcIdentifier 0 1 The tag or label identifier at the particular instance of a product e g the serial number or the position number It is the identifier at the occurrence level FillsVoids IfcRelFillsElement RelatedBuildingElement S 0 1 Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element ConnectedTo IfcRelConnectsElements RelatingElement S 0 Reference to the element connection relationship The relationship then refers to the other element to which this element is connected to IsInterferedByElements IfcRelInterferesElements RelatedElement S 0 Reference to the interference relationship to indicate the element that is interfered The relationship if provided indicates that this element has an interference with one or many other elements NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements InterferesElements IfcRelInterferesElements RelatingElement S 0 Reference to the interference relationship to indicate the element that interferes The relationship if provided indicates that this element has an interference with one or many other elements NOTE There

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcsharedbldgelements/lexical/ifcroof.htm (2016-02-12)
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  • IfcStair
    part of a type or style definition that is common to all reflected instances of the declaring IfcObject or its subtypes IsTypedBy IfcRelDefinesByType 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 IsDefinedBy IfcRelDefinesByProperties 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 IfcProduct 6 ObjectPlacement IfcObjectPlacement 0 1 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 7 Representation IfcProductRepresentation 0 1 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 ReferencedBy IfcRelAssignsToProduct 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 IfcElement 8 Tag IfcIdentifier 0 1 The tag or label identifier at the particular instance of a product e g the serial number or the position number It is the identifier at the occurrence level FillsVoids IfcRelFillsElement RelatedBuildingElement S 0 1 Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element ConnectedTo IfcRelConnectsElements RelatingElement S 0 Reference to the element connection relationship The relationship then refers to the other element to which this element is connected to IsInterferedByElements IfcRelInterferesElements RelatedElement S 0 Reference to the interference relationship to indicate the element that is interfered The relationship if provided indicates that this element has an interference with one or many other elements NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements InterferesElements IfcRelInterferesElements RelatingElement S 0 Reference to the interference relationship to indicate the element that interferes The relationship if provided indicates that this element has an interference with one or many other elements NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements HasProjections IfcRelProjectsElement RelatingElement S 0 Projection relationship that adds a feature using a Boolean union to the IfcBuildingElement ReferencedInStructures IfcRelReferencedInSpatialStructure RelatedElements S 0 Reference relationship to the spatial structure element to which the element is additionally associated This relationship may not be hierarchical an element may be referenced by zero one or many spatial structure elements HasOpenings IfcRelVoidsElement RelatingBuildingElement S 0 Reference to the IfcRelVoidsElement relationship that creates an opening in an element

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcsharedbldgelements/lexical/ifcstair.htm (2016-02-12)
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  • Copyright Notice
    Prior written consent is required if changes are made to the technical specification No Warranty Notice This material is delivered to you as is and buildingSMART International Limited makes no warranty of any kind with regard to it including but not limited to the implied warranties as to its accuracy or fitness for a particular purpose Any use of the technical documentation or the information contained therein is at the risk of the user Documentation may include technical or other inaccuracies or typographical errors buildingSMART International Limited shall not be liable for errors contained therein or for incidental consequential damages in connection with the furnishing performance or use of the material The information contained in this document is subject to change without notice Trademark Notice Industry Foundation Class IFC ifcXML and the logos and are trademarks of buildingSMART International Limited and should be given appropriate credits Membership of any Chapter affiliated to buildingSMART International Limited as indicated by the appellation buildingSMART Member or use of a trademark in conjunction with any documentation developed using IFC 4 documentation does not imply responsibility for or approval of that documentation by buildingSMART International Limited Copyright Exclusion Notice Parts of the IFC4 documentation contain

    Original URL path: http://www.buildingsmart-tech.org/mvd/IFC4Add1/RV/1.0/html/copyright.htm (2016-02-12)
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  • IfcGroup
    any collection of objects being products processes controls resources actors or other groups Thus groups can be nested An object can be part of zero one or many groups Grouping relationships are not required to be hierarchical NOTE Use IfcRelDecomposes together with the appropriate subtypes of IfcProduct to define an hierarchical aggregation of products The group collection is handled by an instance of IfcRelAssignsToGroup which assigns all group members to

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcgroup.htm (2016-02-12)
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  • IfcRoot
    information to the entity In addition it may provide for a name and a description about the concepts HISTORY New entity in IFC Release 1 0 EXPRESS specification ENTITY IfcRoot ABSTRACT SUPERTYPE OF ONEOF IfcPropertyDefinition IfcRelationship IfcObjectDefinition GlobalId IfcGloballyUniqueId OwnerHistory IfcOwnerHistory Name OPTIONAL IfcLabel Description OPTIONAL IfcText UNIQUE UR1 GlobalId END ENTITY Attribute definitions GlobalId Assignment of a globally unique identifier within the entire software world OwnerHistory Assignment of the

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcroot.htm (2016-02-12)
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