IFC 4.3.0.1 (IFC4X3) development

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 collections of IfcPropertySetTemplate or IfcPropertyTemplates

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.

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,

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 strutures only).

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).

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.

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 definitions can be aggregated by several other objects (occurrences or parts).

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 definitions can only be part of a single decomposition (to allow hierarchical strutures only).

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.

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.

9 UnitsInContext OPTIONAL IfcUnitAssignment

Units globally assigned to measure types used within the context.

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.

Declares SET [0:?] OF IfcRelDeclares FOR RelatingContext

Reference to the IfcRelDeclares relationship that assigns the uppermost entities of includes hierarchies to this context instance.

Table 5.1.3.12.A

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)
Aggregation General

No description available.

Approval Association General

No description available.

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.

Constraint Association General

No description available.

Document Association General

No description available.

Library Association General

No description available.

Material Association General

No description available.

Material Single General

No description available.

Nesting General

No description available.

IfcContext (8)
Project Classification Information General

No description available.

Project Context General

No description available.

Project Document Information General

No description available.

Project Global Positioning General

No description available.

Project Library Information General

No description available.

Project Representation Context 3D General

No description available.

Project Template Definitions General

No description available.

Project Type Definitions General

No description available.

Click to show 19 hidden inherited concepts Click to hide 19 inherited concepts
Table 5.1.3.12.B

5.1.3.12.5 Formal representation

ENTITY IfcProjectLibrary
 SUBTYPE OF (IfcContext);
END_ENTITY;

5.1.3.12.6 References

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5.1.3.12.7 Changelog

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