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  • IfcGloballyUniqueId
    for all IFC object instances it is desirable to compress the identifier size to reduce overhead Beginning in IFC R1 5 1 IFC implementers agreed to compress the identifier down to 20 characters using an algorithm developed by IAI Implementers This algorithm maps the identifier bits onto a base 85 digit encoded from the following character set 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz An index 0 84 into this character set string determines the value for each character e g A has a value of 10 has a value of 83 etc Note that all characters are case sensitive In order to prevent possible problems with some parsers implementers have agreed not to use the and character combinations in the identifier string and instead to use and The implementation of the compression algorithm has changed in IFC R2x in order to prevent conflicts with special characters in the ISO 10303 21 exchange file and the W3C XML file such as and Using 64 characters for the base rather than 85 the resulting compressed string now needs 22 characters The encoding of the base 64 character set is shown below 1 2 3 4 5 6 0123456789012345678901234567890123456789012345678901234567890123 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz The following code example in C is given

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcutilityresource/lexical/ifcgloballyuniqueid.htm (2016-02-12)
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  • IfcOwnerHistory
    to the end user who currently owns this object Note that IFC includes the concept of ownership transfer from one user to another and therefore distinguishes between the Owning User and Creating User OwningApplication Direct reference to the application which currently Owns this object on behalf of the owning user who uses this application Note that IFC includes the concept of ownership transfer from one app to another and therefore

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcutilityresource/lexical/ifcownerhistory.htm (2016-02-12)
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  • IfcLabel
    a string which represents the human interpretable name of something and shall have a natural language meaning Type STRING it should be restricted to max 255 characters NOTE Corresponding STEP name label please refer to ISO IS 10303 41 1994

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcmeasureresource/lexical/ifclabel.htm (2016-02-12)
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  • IfcText
    characters which is intended to be read and understood by a human being It is for information purposes only Type STRING NOTE Corresponding STEP name text please refer to ISO IS 10303 41 1994 for the final definition of the

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifcmeasureresource/lexical/ifctext.htm (2016-02-12)
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  • IfcObjectDefinition
    established at the level of the subtypes of the general IfcRelAssigns relationship There is no dependency implied a priori by the assignment Association to external resources an association relationship IfcRelAssociates that refers to external sources of information most notably a classification or document and creates a uni directional association There is no dependency implied by the association Aggregation of other objects an aggregation relationship IfcRelDecomposes that establishes a whole part relation and creates a bi directional relation There is an implied dependency established HISTORY New abstract entity in Release IFC2x Edition 3 IFC2x Edition 3 CHANGE The abstract entity IfcObjectDefinition has been added Upward compatibility for file based exchange is guaranteed EXPRESS specification ENTITY IfcObjectDefinition ABSTRACT SUPERTYPE OF ONEOF IfcObject IfcTypeObject SUBTYPE OF IfcRoot INVERSE HasAssignments SET OF IfcRelAssigns FOR RelatedObjects IsDecomposedBy SET OF IfcRelDecomposes FOR RelatingObject Decomposes SET 0 1 OF IfcRelDecomposes FOR RelatedObjects HasAssociations SET OF IfcRelAssociates FOR RelatedObjects END ENTITY Attribute definitions HasAssignments 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 IsDecomposedBy Reference to the decomposition relationship that allows this object to be the composition

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcobjectdefinition.htm (2016-02-12)
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  • IfcRelAssigns
    are established by the RelatedObjects attribute NOTE The terms client and supplier are used in a general concept and do not imply any meaning for implementations of systems like client server EXAMPLE A resource may receive information about its nature of representing real building products by establishing a link between IfcResource and IfcBuildingElement subtype of IfcProduct throught he assignment relationship IfcRelAssignsToResource The resource is then the client that applies the services of other objects here building elements to express the particular view of elements to be consumed as a resource in a process The assignment relationship establishs a bi directional relationship among the participating objects and does not imply any dependency The subtypes of IfcRelAssigns establishes the particular semantic meaning of the assignment relationship HISTORY New entity in IFC Release 2x EXPRESS specification ENTITY IfcRelAssigns ABSTRACT SUPERTYPE OF ONEOF IfcRelAssignsToProcess IfcRelAssignsToProduct IfcRelAssignsToControl IfcRelAssignsToResource IfcRelAssignsToActor IfcRelAssignsToGroup SUBTYPE OF IfcRelationship RelatedObjects SET 1 OF IfcObjectDefinition RelatedObjectsType OPTIONAL IfcObjectTypeEnum WHERE WR1 IfcCorrectObjectAssignment RelatedObjectsType RelatedObjects END ENTITY Attribute definitions RelatedObjects Related objects which are assigned to a single object The type of the single or relating object is defined in the subtypes of IfcRelAssigns RelatedObjectsType Particular type of the assignment relationship It can constrain

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcrelassigns.htm (2016-02-12)
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  • IfcRelDecomposes
    the same type thus establishing a nesting relationship Or they may require some form of physical containment thus establishing special types of aggregation relationships NOTE There are two special names for decomposition which are linguistically distinguished nesting and aggregation The subtypes of IfcRelDecomposes will introduce either the nesting or aggregation convention see IfcRelNests and IfcRelAggregates EXAMPLE A cost element is a nest of other cost elements Or a structural frame is an aggregation of beams and columns Both are applications of decomposition relationship Decompositions imply a dependency i e the definition of the whole depends on the definition of the parts and the parts depend on the existence of the whole The decomposition relationship can be applied in a recursive manner i e a decomposed element can be part in another decomposition Cyclic references have to be prevented at application level HISTORY New entity in IFC Release 1 5 it is a generalization of the IFC2 0 entity IfcRelNests EXPRESS specification ENTITY IfcRelDecomposes ABSTRACT SUPERTYPE OF ONEOF IfcRelAggregates IfcRelNests SUBTYPE OF IfcRelationship RelatingObject IfcObjectDefinition RelatedObjects SET 1 OF IfcObjectDefinition WHERE WR31 SIZEOF QUERY Temp RelatedObjects RelatingObject Temp 0 END ENTITY Attribute definitions RelatingObject The object that represents the nest or

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/ifckernel/lexical/ifcreldecomposes.htm (2016-02-12)
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  • IfcRelAssociates
    types IfcTypeObject or partial types IfcPropertySetDefinition EXAMPLE 1 The classification information for the tank equipment may be associated to the IfcTypeProduct subtype of IfcTypeObject defining the specific information for all occurrences of that tank in the project Therefore the association of the e g Uniclass notation L6814 may be associated by a subtype of IfcRelAssociates to the type information EXAMPLE 2 The classification information for a particular space within a building may the associated to the IfcSpace object subtype of IfcObject defining a particular occurrence of space Therefore the association of the e g DIN notation HNF 1 5 may be associated by a subtype of IfcRelAssociates to the object The association relationship establishs a uni directional association The subtypes of IfcRelAssociates establishes the particular semantic meaning of the association relationship HISTORY New entity in IFC Release 2x NOTE Users should not instantiate the entity IfcRelAssociates from IFC2x Edition2 onwards It will be changed into an ABSTRACT supertype in future releases of IFC EXPRESS specification ENTITY IfcRelAssociates SUPERTYPE OF ONEOF IfcRelAssociatesClassification IfcRelAssociatesDocument IfcRelAssociatesLibrary SUBTYPE OF IfcRelationship RelatedObjects SET 1 OF IfcRoot WHERE WR21 SIZEOF QUERY temp RelatedObjects NOT IFCKERNEL IFCOBJECTDEFINITION IN TYPEOF temp OR IFCKERNEL IFCPROPERTYDEFINITION IN TYPEOF temp 0

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