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  • IfcBuildingElement
    association to library documentation or classification IfcObject 5 ObjectType IfcLabel 0 1 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 IsDeclaredBy IfcRelDefinesByObject 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 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

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcproductextension/lexical/ifcbuildingelement.htm (2016-02-12)
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  • IfcElement
    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 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

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcproductextension/lexical/ifcelement.htm (2016-02-12)
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  • IfcDistributionElement
    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 is no indication of precedence between IsInterferedByElements and InterferesElements HasProjections IfcRelProjectsElement RelatingElement S 0 Projection relationship that adds a feature using a Boolean

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcproductextension/lexical/ifcdistributionelement.htm (2016-02-12)
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  • IfcCoordinateReferenceSystem
    Petroleum Survey Group EPSG It should then be qualified by the EPSG name space for example as EPSG 5555 2 Description IfcText 0 1 Informal description of this coordinate reference system 3 GeodeticDatum IfcIdentifier 0 1 Name by which this datum is identified The geodetic datum is associated with the coordinate reference system and indicates the shape and size of the rotation ellipsoid and this ellipsoid s connection and orientation to the actual globe earth It needs to be provided if the Name identifier does not unambiguously define the geodetic datum as well EXAMPLE geodetic datums include ED50 EUREF89 WSG84 4 VerticalDatum IfcIdentifier 0 1 Name by which the vertical datum is identified The vertical datum is associated with the height axis of the coordinate reference system and indicates the reference plane and fundamental point defining the origin of a height system It needs to be provided if the Name identifier does not unambiguously define the vertical datum as well and if the coordinate reference system is a 3D reference system EXAMPLE vertical datums include DHHN92 the German Haupthöhennetz EVRS2007 the European Vertical Reference System HasCoordinateOperation IfcCoordinateOperation SourceCRS S 0 1 Indicates conversion between coordinate systems In particular it refers to an IfcCoordinateOperation between this coordinate reference system and another Geographic coordinate reference system Inherited definitions from supertypes Attribute inheritance Attribute Type Cardinality Description IfcCoordinateReferenceSystem 1 Name IfcLabel 1 1 Name by which the coordinate reference system is identified NOTE The name shall be taken from the list recognized by the European Petroleum Survey Group EPSG It should then be qualified by the EPSG name space for example as EPSG 5555 2 Description IfcText 0 1 Informal description of this coordinate reference system 3 GeodeticDatum IfcIdentifier 0 1 Name by which this datum is identified The geodetic datum is associated

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcrepresentationresource/lexical/ifccoordinatereferencesystem.htm (2016-02-12)
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  • IfcPropertySetDefinition
    relationship to IfcRelDefinesByProperties that applies the property set with all included properties to the object occurrence NOTE Properties assigned to object occurrences may override properties assigned to the object type See IfcRelDefinesByType for further information HISTORY New entity in IFC2x IFC4 CHANGE The subtype IfcPreDefinedPropertySet has been added Attribute definitions Attribute Type Cardinality Description DefinesType IfcTypeObject HasPropertySets S 0 The type object to which the property set is assigned The property set acts as a shared property set to all occurrences of the type object NOTE The relationship between the IfcPropertySetDefinition and the IfcTypeObject is a direct relationship not utilizing IfcRelDefinesByProperties for maintaining compatibility with earlier releases of this standard IsDefinedBy IfcRelDefinesByTemplate RelatedPropertySets S 0 Relation to the property set template via the objectified relationship IfcRelDefinesByTemplate that if given provides the definition template for the property set or quantity set and its properties DefinesOccurrence IfcRelDefinesByProperties RelatingPropertyDefinition S 0 Reference to the relation to one or many object occurrences that are characterized by the property set definition A single property set can be assigned to multiple object occurrences using the objectified relationship IfcRefDefinesByProperties 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

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifckernel/lexical/ifcpropertysetdefinition.htm (2016-02-12)
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  • IfcGeometricRepresentationSubContext
    showing the geometric shape of the product depending on the target view and scale HISTORY New entity in IFC2x2 Attribute definitions Attribute Type Cardinality Description 7 ParentContext IfcGeometricRepresentationContext 1 1 Parent context from which the sub context derives its world coordinate system precision space coordinate dimension and true north 8 TargetScale IfcPositiveRatioMeasure 0 1 The target plot scale of the representation to which this representation context applies NOTE Scale indicates the target plot scale for the representation sub context all annotation styles are given in plot dimensions according to this target plot scale If multiple instances of IfcGeometricRepresentationSubContext are given having the same TargetView value the target plot scale applies up to the next smaller scale or up to unlimited small scale NOTE Scale 1 100 given as 0 01 within TargetScale is bigger then 1 200 given as 0 005 within TargetScale 9 TargetView IfcGeometricProjectionEnum 1 1 Target view of the representation to which this representation context applies 10 UserDefinedTargetView IfcLabel 0 1 User defined target view this attribute value shall be given if the TargetView attribute is set to USERDEFINED WorldCoordinateSystem ParentContext WorldCoordinateSystem IfcAxis2Placement 1 1 CoordinateSpaceDimension ParentContext CoordinateSpaceDimension IfcDimensionCount 1 1 TrueNorth NVL ParentContext TrueNorth IfcConvertDirectionInto2D SELF IfcGeometricRepresentationContext WorldCoordinateSystem P 2 IfcDirection 1 1 Precision NVL ParentContext Precision 1 E 5 IfcReal 1 1 Formal Propositions Rule Description ParentNoSub The parent context shall not be another geometric representation sub context UserTargetProvided The attribute UserDefinedTargetView shall be given if the attribute TargetView is set to USERDEFINED NoCoordOperation An IfcCoordinateOperation shall not be provided to a geometric representation sub context only to the parent geometric representation context NOTE The coordinate operation is used to define the coordinate transformation of the project engineering coordinate system to a geographic coordinate reference system Inherited definitions from supertypes Attribute inheritance Attribute Type Cardinality Description IfcRepresentationContext 1 ContextIdentifier IfcLabel 0 1 The optional identifier of the representation context as used within a project 2 ContextType IfcLabel 0 1 The description of the type of a representation context The supported values for context type are to be specified by implementers agreements RepresentationsInContext IfcRepresentation ContextOfItems S 0 All shape representations that are defined in the same representation context IfcGeometricRepresentationContext HasSubContexts IfcGeometricRepresentationSubContext ParentContext S 0 The set of IfcGeometricRepresentationSubContexts that refer to this IfcGeometricRepresentationContext HasCoordinateOperation IfcCoordinateOperation SourceCRS S 0 1 Indicates conversion between coordinate systems In particular it refers to an IfcCoordinateOperation between a Geographic coordinate reference system and the engineering coordinate system of this construction project IfcGeometricRepresentationSubContext 7 ParentContext IfcGeometricRepresentationContext 1 1 Parent context from which the sub context derives its world coordinate system precision space coordinate dimension and true north 8 TargetScale IfcPositiveRatioMeasure 0 1 The target plot scale of the representation to which this representation context applies NOTE Scale indicates the target plot scale for the representation sub context all annotation styles are given in plot dimensions according to this target plot scale If multiple instances of IfcGeometricRepresentationSubContext are given having the same TargetView value the target plot scale applies up to the next

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcrepresentationresource/lexical/ifcgeometricrepresentationsubcontext.htm (2016-02-12)
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  • IfcBoxedHalfSpace
    check first whether size boxes intersect if not no calculations has to be done to check whether the solids of the entities intersect The Enclosure therefore helps to prevent dealing with infinite size related issues The enclosure box is positioned within the object coordinate system established by the ObjectPlacement of the element represented for example by IfcLocalPlacement Figure 344 shows the Enclosure box being sufficiently large to fully enclose the Boolean result Figure 344 Boxed half space geometry NOTE Definition according to ISO CD 10303 42 1992 This entity is a subtype of the half space solid which is trimmed by a surrounding rectangular box The box has its edges parallel to the coordinate axes of the geometric coordinate system The purpose of the box is to facilitate CSG computations by producing a solid of finite size NOTE Entity adapted from boxed half space defined in ISO 10303 42 HISTORY New entity in IFC1 5 1 IFC4 CHANGE Usage correct position coordinate system for Enclosure is the object coordinate system Attribute definitions Attribute Type Cardinality Description 3 Enclosure IfcBoundingBox 1 1 The box which bounds the resulting solid of the Boolean operation involving the half space solid for computational purposes only Formal Propositions Rule Description UnboundedSurface The BaseSurface defining the half space shall not be a bounded surface Inherited definitions from supertypes Attribute inheritance Attribute Type Cardinality Description IfcRepresentationItem LayerAssignment IfcPresentationLayerAssignment AssignedItems S 0 1 Assignment of the representation item to a single or multiple layer s The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items StyledByItem IfcStyledItem Item S 0 1 Reference to the IfcStyledItem that provides presentation information to the representation e g a curve style including colour and thickness to a geometric curve IfcGeometricRepresentationItem IfcHalfSpaceSolid 1 BaseSurface IfcSurface 1

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifcgeometricmodelresource/lexical/ifcboxedhalfspace.htm (2016-02-12)
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  • IfcObject
    subtypes In particular it holds the user defined type if the enumeration of the attribute PredefinedType is set to USERDEFINED IsDeclaredBy IfcRelDefinesByObject 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 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 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

    Original URL path: http://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/schema/ifckernel/lexical/ifcobject.htm (2016-02-12)
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