IfcProject

Item	Change	Description
IFC2x3 to IFC4
IfcProject
OwnerHistory	MODIFIED	Instantiation changed to OPTIONAL.
RepresentationContexts	MODIFIED	Instantiation changed to OPTIONAL.
UnitsInContext	MODIFIED	Instantiation changed to OPTIONAL.

Rule	Description
HasName	The Name attribute has to be provided for IfcProject. It is the short name for the project.
CorrectContext	If a RepresentationContexts relation is provided then there shall be no instance of IfcGeometricRepresentationSubContext directly included in the set of RepresentationContexts.
NoDecomposition	The IfcProject represents the root of the any decomposition tree. It shall therefore not be used to decompose any other object definition.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
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).	X
	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.	X
	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.	X
	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
IfcProject

Definitions applying to Common Use Definitions

Instance diagram

Concept usage

Spatial Decomposition

The Spatial Decomposition concept applies to this entity as shown in Table 4.

Spatial Parts	Description
IfcSite	If referenced, the site is the root of the spatial structure.
IfcBuilding	If referenced, the building is the root of the spatial structure (no explicit site information included).
IfcSpatialZone	If referenced, the spatial zone is the root of the spatial structure (to be used as a stub for non-building related projects).

Table 4 — IfcProject Spatial Decomposition

The IfcProject is used to reference the root of the spatial structure of a building or other construction project (that serves as the primary project breakdown and is required to be hierarchical). The spatial structure elements are linked together, and to the IfcProject, by using the objectified relationship IfcRelAggregates.

The following constraints are applied to using the relationshio IfcRelAggregates in context of IfcProject

NOTE The anomaly to use the composition structure through IfcRelAggregates for assigning the uppermost spatial container to IfcProject is due to upward compatibility reasons with earlier releases of this standard.

IfcProject.Decomposes -- it shall be NIL, i.e. the IfcProject shall be on top of the root of the spatial structure tree.
IfcProject.IsDecomposedBy -- referencing (IfcSite || IfcBuilding || IfcSpatialZone) by using IfcRelAggregates.RelatedObjects. The IfcSite, IfcBuilding, or IfcSpatialZone being referenced shall be the root of the spatial structure.

Figure 119 illustrates project relationships with spatial structures, elements, and element type libraries.

Figure 119 — Project spatial structure, products and product type library

Project Declaration

The Project Declaration concept applies to this entity as shown in Table 5.

Type	Description
IfcProjectLibrary	Referenced projects incorporated into this project.
IfcPropertySetTemplate	Property set templates defined by this project.
IfcTypeObject	Type definition defined by this project.
IfcActor	Actors participating in this project.
IfcControl	Controls issued within this project.
IfcGroup	Groups defined by this project.
IfcProcess	Processes defined by this project.
IfcResource	Resources defined by this project.

Table 5 — IfcProject Project Declaration

The IfcProject is also the context for other information about the construction project such as a work plan. Non-product structures are assigned by their first level object to IfcProject using the IfcRelDeclares relationship. The IfcProject provides the context for work plans (or other non-product based) descriptions of the construction project. It is handled by the objectified relationship IfcRelDeclares.

NOTE The spatial structure and the schedule structure can be decomposed. For example the IfcBuilding can be decomposed into IfcBuildingStorey's, and the IfcWorkPlan can be decomposed into IfcWorkSchedule's.

NOTE The products and tasks can be decomposed further. For example the IfcCurtainWall can be decomposed into IfcMember and IfcPlate, the IfcTask can be decomposed into other IfcTask's.

NOTE The products and tasks can have direct linking relationships. For example the IfcCurtainWall can be assigned to a IfcTask as an input or output for a construction schedule.

Figure 120 illustrates the use of IfcProject as context for work plans or work schedules.


Figure 120 — Project spatial and work plan structure

Project Units

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

DerivedUnitType	Description
	Length unit as meters, millimeters, or inches.

Table 6 — IfcProject Project Units

Project Representation Context

The Project Representation Context concept applies to this entity as shown in Table 7.

ContextIdentifier	ContextType	Description
Model	3D	Context for all 3D geometry.
Plan	2D	Context for all 2D annotations.

Table 7 — IfcProject Project Representation Context

Project Classification Information

The Project Classification Information concept applies to this entity.

Project Document Information

The Project Document Information concept applies to this entity.

Project Library Information

The Project Library Information concept applies to this entity.

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Common Use Definitions
	Revision Control	Common Use Definitions
IfcProject
	Spatial Decomposition	Common Use Definitions
	Project Declaration	Common Use Definitions
	Project Units	Common Use Definitions
	Project Representation Context	Common Use Definitions
	Project Classification Information	Common Use Definitions
	Project Document Information	Common Use Definitions
	Project Library Information	Common Use Definitions

Examples

Basic unit declaration

Formal representations

XSD Specification

 <xs:element name="IfcProject" type="ifc:IfcProject" substitutionGroup="ifc:IfcContext" nillable="true"/>

 <xs:complexType name="IfcProject">

  <xs:complexContent>

   <xs:extension base="ifc:IfcContext"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcProject

 SUBTYPE OF (IfcContext);

 WHERE

  HasName : EXISTS(SELF\IfcRoot.Name);
  CorrectContext : NOT(EXISTS(SELF\IfcContext.RepresentationContexts)) OR
(SIZEOF(QUERY(Temp <* SELF\IfcContext.RepresentationContexts |
 'IFCREPRESENTATIONRESOURCE.IFCGEOMETRICREPRESENTATIONSUBCONTEXT' IN TYPEOF(Temp)
  )) = 0);
  NoDecomposition : SIZEOF(SELF\IfcObjectDefinition.Decomposes) = 0;
END_ENTITY;

 EXPRESS-G diagram

Link to this page

	Projekt
	Project
	Projet

IfcProject

Semantic definitions at the entity

Inherited definitions from supertypes

Definitions applying to Common Use Definitions

Examples

Formal representations