5.1.3.12 IfcProjectLibrary
5.1.3.12.1 Semantic definition
An IfcProjectLibrary collects all library elements that are included within a referenced project data set.
Examples for project libraries include:
- type libraries (also called style or family libraries): a collection of subtypes of IfcTypeObject
- property definition libraries: a collection of IfcPropertySetTemplate or IfcPropertyTemplate entities
The inherited attributes RepresentationContext and UnitsInContext have the following meaning:
- Context of the representations used within the project library. When the project library includes shape representations for its library type objects, one or several geometric representation contexts need to be included that define the coordinate system, the coordinate space dimensions, and/or the precision factor,
- Units locally assigned to measure types used within the context of this project library.
Instances of IfcProjectLibrary are assigned to the project context using the IfcRelDeclares relationship and accessible through the inverse attribute HasContext. Individual object types and property (set) templates are assigned to the IfcProjectLibrary using the IfcRelDeclares relationship and are accessible through the inverse attribute Declares. An IfcProjectLibrary may be decomposed into sub libraries using the relationship IfcRelNests. Sub libraries are accessed by the IfcProjectLibrary through the inverse attribute IsNestedBy.
New entity in IFC4.5.1.3.12.2 Entity inheritance
5.1.3.12.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcRoot (4) | |||
| 1 | GlobalId | IfcGloballyUniqueId |
Assignment of a globally unique identifier within the entire software world. |
| 2 | OwnerHistory | OPTIONAL IfcOwnerHistory |
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, Only the last modification is stored - either as addition, deletion or modification. The attribute has been changed to be OPTIONAL. |
| 3 | Name | OPTIONAL IfcLabel |
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 | OPTIONAL IfcText |
Optional description, provided for exchanging informative comments. |
| IfcObjectDefinition (7) | |||
| HasAssignments | SET [0:?] OF IfcRelAssigns FOR RelatedObjects |
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 | SET [0:1] OF IfcRelNests FOR RelatedObjects |
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 structures only). The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition. |
|
| IsNestedBy | SET [0:?] OF IfcRelNests FOR RelatingObject |
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). The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition. |
|
| HasContext | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions |
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. The inverse attribute datatype has been added. |
|
| IsDecomposedBy | SET [0:?] OF IfcRelAggregates FOR RelatingObject |
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 definition can be aggregated by several other objects (occurrences or parts). The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates. |
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| Decomposes | SET [0:1] OF IfcRelAggregates FOR RelatedObjects |
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 definition can only be part of a single decomposition (to allow hierarchical structures only). The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates. |
|
| HasAssociations | SET [0:?] OF IfcRelAssociates FOR RelatedObjects |
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. |
|
| Click to show 11 hidden inherited attributes Click to hide 11 inherited attributes | |||
| IfcContext (7) | |||
| 5 | ObjectType | OPTIONAL IfcLabel |
The object type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. 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 enumeration. |
| 6 | LongName | OPTIONAL IfcLabel |
Long name for the context as used for reference purposes. |
| 7 | Phase | OPTIONAL IfcLabel |
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 | OPTIONAL SET [1:?] OF IfcRepresentationContext |
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. The attribute has been changed to be optional. Change made with upward compatibility for file based exchange. |
| 9 | UnitsInContext | OPTIONAL IfcUnitAssignment |
Units globally assigned to measure types used within the context. The attribute has been changed to be optional. Change made with upward compatibility for file based exchange. |
| IsDefinedBy | SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjects |
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. The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange. |
|
| Declares | SET [0:?] OF IfcRelDeclares FOR RelatingContext |
Reference to the IfcRelDeclares relationship that assigns the uppermost entities of included hierarchies to this context instance. The spatial hierarchy is assigned to IfcProject using the IfcRelAggregates relationship. This is a single exception due to compatibility reasons with earlier releases. |
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5.1.3.12.4 Concept usage
| Concept | Usage | Description | |
|---|---|---|---|
| IfcRoot (2) | |||
| Revision Control | General |
Ownership, history, and merge state is captured using IfcOwnerHistory. |
|
| Software Identity | General |
IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept. |
|
| IfcObjectDefinition (9) | |||
| Classification Association | General |
Any object occurrence or object type can have a reference to a specific classification reference, i.e. to a particular facet within a classification system. |
|
| Aggregation | General |
No description available. |
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| Approval Association | General |
No description available. |
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| Constraint Association | General |
No description available. |
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| Document Association | General |
No description available. |
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| Library Association | General |
No description available. |
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| Material Association | General |
No description available. |
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| Material Single | General |
No description available. |
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| Nesting | General |
No description available. |
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| IfcContext (7) | |||
| Project Classification Information | General |
No description available. |
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| Project Context | General |
No description available. |
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| Project Document Information | General |
No description available. |
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| Project Library Information | General |
No description available. |
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| Project Representation Context 3D | General |
No description available. |
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| Project Template Definitions | General |
No description available. |
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| Project Type Definitions | General |
No description available. |
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| Click to show 18 hidden inherited concepts Click to hide 18 inherited concepts | |||
5.1.3.12.5 Formal representation
ENTITY IfcProjectLibrary
SUBTYPE OF (IfcContext);
END_ENTITY;