IfcProjectLibrary

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcProjectLibrary			ADDED

Semantic definitions at the entity

Entity 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.

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.

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.

HISTORY New entity in IFC4.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	B
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[0:1]	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, NOTE only the last modification in stored - either as addition, deletion or modification.	X
3	Name	IfcLabel	[0:1]	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.	X
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @RelatedObjects	S[0:?]	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.	X
	Nests	IfcRelNests @RelatedObjects	S[0:1]	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	IfcRelNests @RelatingObject	S[0:?]	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).	X
	HasContext	IfcRelDeclares @RelatedDefinitions	S[0:1]	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	IfcRelAggregates @RelatingObject	S[0:?]	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).	X
	Decomposes	IfcRelAggregates @RelatedObjects	S[0:1]	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).	X
	HasAssociations	IfcRelAssociates @RelatedObjects	S[0:?]	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.	X
IfcContext
5	ObjectType	IfcLabel	[0:1]	The object type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. NOTE 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 enumaration.	X
6	LongName	IfcLabel	[0:1]	Long name for the context as used for reference purposes.	X
7	Phase	IfcLabel	[0:1]	Current project phase, or life-cycle phase of this project. Applicable values have to be agreed upon by view definitions or implementer agreements.	X
8	RepresentationContexts	IfcRepresentationContext	S[1:?]	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.	X
9	UnitsInContext	IfcUnitAssignment	[0:1]	Units globally assigned to measure types used within the context.	X
	IsDefinedBy	IfcRelDefinesByProperties @RelatedObjects	S[0:?]	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	IfcRelDeclares @RelatingContext	S[0:?]	Reference to the IfcRelDeclares relationship that assigns the uppermost entities of includes hierarchies to this context instance. NOTE The spatial hiearchy is assigned to IfcProject using the IfcRelAggregates relationship. This is a single exception due to compatibility reasons with earlier releases.	X
IfcProjectLibrary

Definitions applying to Bridge View

Instance diagram

Libraries of components standardized by DOT agencies may be referenced from external locations and encapsulated within project libraries. Such components may include DOT-standardized assemblies for piers, abutments, and bridge decks, as well as more general-purpose shapes such as AISC steel shapes and ACI rebar bending types.

As units may vary between components, each library may define its own.

Concept usage

Project Declaration

The Project Declaration concept applies to this entity.

Exchange
Import	O	O
Export	O	O

Project Units

The Project Units concept applies to this entity.

Exchange
Import	O	O
Export	O	O

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Bridge View
	User Identity	Bridge View
	Object Ownership	Bridge View
IfcProjectLibrary
	Project Declaration	Bridge View
	Project Units	Bridge View

Formal representations

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

Link to this page

	Projekbibliothek
	Project Library