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
HISTORY New entity in IFC4.
Attribute use definition
- 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.
NOTE It is generally discouraged to use a different length measure and plane angle measure in an included project library compared with the project itself. It may lead to unexpected results for the shape representation of items included in the project library.
Relationship use definition
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.
XSD Specification: <xs:element name="IfcProjectLibrary" type="ifc:IfcProjectLibrary" substitutionGroup="ifc:IfcContext" nillable="true"/>
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