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  • IfcObject
    to store the user defined value for all subtypes of IfcObject where a PredefinedType attribute is given and its value is set to USERDEFINED to provide a type information could be seen as a very lightweight classifier of the subtype of IfcObject if no PredefinedType attribute is given This is often the case if no comprehensive list of predefined types is available Objects are independent pieces of information that might contain or reference other pieces of information There are four essential kind of relationships in which objects can be involved Assignment of other objects an assignment relationship that refers to other types of objects See supertype IfcObjectDefinition for more information Association to external resources an association relationship that refers to external sources of information See supertype IfcObjectDefinition for more information Aggregation of other objects an aggregation relationship that establishes a whole part relation See supertype IfcObjectDefinition for more information Refinement by type and properties a refinement relationship IfcRelDefines that uses a type definition or partial property set definition to define the properties of the object instance It is a specific occurrence relationship with implied dependencies as the occurrence properties depend on the specific properties HISTORY New Entity in IFC Release 1 0 EXPRESS specification ENTITY IfcObject ABSTRACT SUPERTYPE OF ONEOF IfcActor IfcControl IfcGroup IfcProcess IfcProduct IfcProject IfcResource SUBTYPE OF IfcObjectDefinition ObjectType OPTIONAL IfcLabel INVERSE IsDefinedBy SET OF IfcRelDefines FOR RelatedObjects WHERE WR1 SIZEOF QUERY temp IsDefinedBy IFCKERNEL IFCRELDEFINESBYTYPE IN TYPEOF temp 1 END ENTITY Attribute definitions ObjectType 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 IsDefinedBy Set of relationships to type or property statically or dynamically

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcobject.htm (2016-02-12)
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  • IfcRelDefines
    and several objects occurrences Those occurrences then share the same type or partial type information EXAMPLE Several instances of windows within the IFC project model may be of the same catalogue or manufacturer type Thereby they share the same properties This relationship is established by a subtype of the IfcRelDefines relationship assigning an IfcProductType or subtype thereof to the IfcWindow HISTORY New entity in IFC Release 2x EXPRESS specification ENTITY

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcreldefines.htm (2016-02-12)
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  • IfcRelAssignsToGroup
    The inherited attribute RelatedObjects gives the references to the objects which are the elements within the group The RelatingGroup is the group that comprises all elements Informal proposition The group assignment relationship shall be a cyclic i e a group should not participate in its own grouping relationship HISTORY New entity in IFC Release 1 0 Has been renamed from IfcRelGroups in IFC Release 2x EXPRESS specification ENTITY IfcRelAssignsToGroup SUBTYPE

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcrelassignstogroup.htm (2016-02-12)
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  • IFCPRODUCTEXTENSION
    and zone are introduced within the IfcProductExtension Relationships between the spatial structure and the elements are defined such as spatial containment and space boundaries An element is assigned to the spatial project structure and may refer by its placement to a grid Basic types of elements which are introduced are building element opening element furnishing element distribution element including heating ventilation air conditioning electrical and equipment elements transportation element The other concepts introduced are a grid providing a constraint placement for elements an annotation to capture any additional annotations to a building model or plan such as explanatory text dimensioning etc and a port providing connectivity between elements Interfaced schemas 18 REFERENCE FROM IFCACTORRESOURCE IfcActorSelect IfcPerson IfcPersonAndOrganization IfcPostalAddress REFERENCE FROM IFCDATETIMERESOURCE IfcDateTimeSelect IfcCalendarDate IfcDateAndTime IfcLocalTime REFERENCE FROM IFCEXTERNALREFERENCERESOURCE IfcClassificationReference REFERENCE FROM IFCGEOMETRICCONSTRAINTRESOURCE IfcConnectionGeometry IfcConnectionSurfaceGeometry IfcGridAxis REFERENCE FROM IFCGEOMETRICMODELRESOURCE IfcBoundingBox IfcGeometricSet REFERENCE FROM IFCGEOMETRYRESOURCE IfcLine IfcConic IfcGeometricRepresentationItem IfcAxis2Placement IfcAxis2Placement2D IfcAxis2Placement3D IfcTrimmedCurve IfcCompositeCurve IfcPolyline IfcBezierCurve REFERENCE FROM IFCKERNEL IfcGroup IfcRelAssignsToGroup IfcProxy IfcObject IfcProduct IfcRelConnects IfcPropertySetDefinition IfcRelAggregates IfcRelAssociates IfcRoot IfcTypeProduct REFERENCE FROM IFCMATERIALRESOURCE IfcMaterialSelect IfcMaterial IfcMaterialList IfcMaterialLayerSet REFERENCE FROM IFCMEASURERESOURCE IfcLengthMeasure IfcPositiveLengthMeasure IfcCompoundPlaneAngleMeasure IfcUnit IfcDerivedUnit IfcNamedUnit IfcContextDependentUnit IfcConversionBasedUnit IfcSiUnit IfcIdentifier IfcLabel IfcMassMeasure IfcCountMeasure REFERENCE FROM IFCPRESENTATIONAPPEARANCERESOURCE IfcNullStyle REFERENCE FROM IFCPROFILEPROPERTYRESOURCE REFERENCE FROM IFCPROPERTYRESOURCE

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcproductextension/ifcproductextension.htm (2016-02-12)
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  • IfcSpatialStructureElement
    A building should not be directly or indirectly associated to a storey or space A storey should not be directly or indirectly associated to a space HISTORY New entity in IFC Release 2x Spatial Structure Use Definition The figure shows the use of IfcRelAggregates to establish a spatial structure including site building building section and storey More information is provided at the level of the subtypes EXPRESS specification ENTITY IfcSpatialStructureElement ABSTRACT SUPERTYPE OF ONEOF IfcBuilding IfcBuildingStorey IfcSpace IfcSite SUBTYPE OF IfcProduct LongName OPTIONAL IfcLabel CompositionType IfcElementCompositionEnum INVERSE ReferencesElements SET OF IfcRelReferencedInSpatialStructure FOR RelatingStructure ServicedBySystems SET OF IfcRelServicesBuildings FOR RelatedBuildings ContainsElements SET OF IfcRelContainedInSpatialStructure FOR RelatingStructure WHERE WR41 HIINDEX SELF IfcObjectDefinition Decomposes 1 AND IFCKERNEL IFCRELAGGREGATES IN TYPEOF SELF IfcObjectDefinition Decomposes 1 AND IFCKERNEL IFCPROJECT IN TYPEOF SELF IfcObjectDefinition Decomposes 1 RelatingObject OR IFCPRODUCTEXTENSION IFCSPATIALSTRUCTUREELEMENT IN TYPEOF SELF IfcObjectDefinition Decomposes 1 RelatingObject END ENTITY Attribute definitions LongName Long name for a spatial structure element used for informal purposes Maybe used in conjunction with the inherited Name attribute CompositionType 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 ReferencesElements 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 IFC2x Edition 3 CHANGE The inverse attribute has been added with upward compatibility for file based exchange ServicedBySystems Set of relationships to Systems that provides a certain service to the Building

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcproductextension/lexical/ifcspatialstructureelement.htm (2016-02-12)
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  • IfcInternalOrExternalEnum
    building or outside the building Enumeration INTERNAL IfcSpace The space is an internal space fully enclosed by physical boundaries directly or indirectly through adjacent spaces IfcSpaceBoundary The space boundary faces to the inside of an internal space EXTERNAL IfcSpace The space is an external space not or only partially enclosed by physical boundaries IfcSpaceBoundary The space boundary faces to the outer space or the inside of an external space NOTDEFINED

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcproductextension/lexical/ifcinternalorexternalenum.htm (2016-02-12)
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  • IfcLengthMeasure
    is the value of a distance Usually measured in millimeters mm Type REAL NOTE Corresponding STEP name length measure please refer to ISO IS 10303 41 1994 for the final definition of the formal standard HISTORY New type in IFC

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcmeasureresource/lexical/ifclengthmeasure.htm (2016-02-12)
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  • IfcRelCoversSpaces
    always made to the space The IFC specification provides two relationships IfcRelCoversBldgElements to assign coverings to elements and IfcRelCoversSpaces to assign coverings to spaces Which relationship should be applied has to be determined by the context of the project or application NOTE View definition may determine the necessity to use either of the two relationship elements HISTORY New Entity in Release IFC 2x Edition 3 EXPRESS specification ENTITY IfcRelCoversSpaces SUBTYPE

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