#### 5.1.3.10 IfcProjectLibrary

| Projekbibliothek

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

SELF\IfcContext.RepresentationContext
  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.
SELF\IfcContext.UnitsInContext
  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.

## Building Automation

The following concepts are inherited at supertypes:

- IfcRoot: Revision Control

Instance diagram

Project Library Information

The Project Library Information concept applies to this entity.

Exchange |  |  |  |  |
--- | --- | --- | --- | --- | ---
Import |  |  |  |  |
Export |  |  |  |  |

Project Declaration

The Project Declaration concept applies to this entity as shown in Table 6.

Type | Description
--- | ---
IfcDistributionElementType | Device types indicate physical models with defined properties and assigned process types for programmable behavior.
IfcPropertySetTemplate | Property set templates indicate groups of settings that may be accessed on device types or groups of parameters that may be passed with procedures or events.
IfcTaskType | Task types indicate programs that may be run on instances of assigned devices.
IfcProcedureType | Procedure types indicate actions that may be invoked on instances of assigned devices.
IfcEventType | Event types indicate notifications that may be received from instances of assigned devices.
Table 6 — IfcProjectLibrary Project Declaration

Exchange |  |  |  |  |
--- | --- | --- | --- | --- | ---
Import |  |  |  |  |
Export |  |  |  |  |

XSD Specification:

<xs:element name="IfcProjectLibrary" type="ifc:IfcProjectLibrary" substitutionGroup="ifc:IfcContext" nillable="true"/>
<xs:complexType name="IfcProjectLibrary">
<xs:complexContent>
<xs:extension base="ifc:IfcContext"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcProjectLibrary

| SUBTYPE OF IfcContext;

END_ENTITY;

EXPRESS-G diagram

Inheritance Graph:

ENTITY IfcProjectLibrary

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
Nests | : | SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy | : | SET OF IfcRelNests FOR RelatingObject;
HasContext | : | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy | : | SET OF IfcRelAggregates FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;

| ENTITY IfcContext

ObjectType | : | OPTIONAL IfcLabel;
LongName | : | OPTIONAL IfcLabel;
Phase | : | OPTIONAL IfcLabel;
RepresentationContexts | : | OPTIONAL SET [1:?] OF IfcStrippedOptional;
UnitsInContext | : | OPTIONAL IfcUnitAssignment;

| INVERSE

IsDefinedBy | : | SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjects;
Declares | : | SET OF IfcRelDeclares FOR RelatingContext;

| ENTITY IfcProjectLibrary

END_ENTITY;

Examples:

- Air terminal library object

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