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	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
IfcProject

Definitions applying to Bridge View

Instance diagram

Concept usage

Spatial Decomposition

The Spatial Decomposition concept applies to this entity as shown in Table 1.

Spatial Parts	Description
IfcSite	If referenced, the site is the root of the spatial structure.

Table 1 — IfcProject Spatial Decomposition

The project is decomposed into one or more sites, where typically a single site is defined within a file. Unlike for buildings, which may form a spatial hierarchy of buildings, floors, and spaces, no such hierarchy is currently defined for bridges, as spatial usage is not within scope.

NOTE A future version may define spatial types for infrastructure, such as roadways or lanes. This model view is intentionally sparse in this regard to allow for compatible future expansion if/when needed for modeling the functional usage of bridges.

Exchange
Import		R
Export		R

Project Declaration

The Project Declaration concept applies to this entity as shown in Table 2.

Type	Description
IfcProjectLibrary	Referenced projects incorporated into this project.
IfcTypeObject	Type definitions defined by this project.
IfcActor	Actors participating in this project.
IfcCostSchedule	Quantity takeoff schedules.
IfcTask	Stages of bridge construction, assigned to corresponding girder framing.
IfcStructuralAnalysisModel	Structural analysis model with sufficient detail to describe load combinations and results for camber ordinates, but not necessarily full result details.
IfcDistributionSystem	Distribution systems for drainage or electrical conduit

Table 2 — IfcProject Project Declaration

This relationship is used to declare templates and other non-physical data that may be referenced by the physical bridge structure.

Exchange
Import		O	R	R
Export		O	R	R

Project Units

The Project Units concept applies to this entity as shown in Table 3.

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

Table 3 — IfcProject Project Units

The project may indicate default units. In the absense of such information, metric is assumed using SI base units, with degrees used for angles.

If imperial units are used, the recommended unit for length is inches.

Exchange
Import	R	R	R	R
Export	R	R	R	R

Project Representation Context

The Project Representation Context concept applies to this entity as shown in Table 4.

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

Table 4 — IfcProject Project Representation Context

Exchange
Import	R	R	R	R
Export	R	R	R	R

Project Global Positioning

The Project Global Positioning concept applies to this entity.

Exchange
Import		O
Export		O

Object Type Definitions

The Object Type Definitions concept applies to this entity as shown in Table 5.

Type	Description
IfcCivilElementType	Templates of supporting structures including piers and abutments
IfcSlabType	Templates of bridge decks
IfcBeamType	Templates of bridge girders
IfcMechanicalFastenerType	Templates of bearings
IfcElementAssemblyType	Templates of cross-framing

Table 5 — IfcProject Object Type Definitions

Exchange
Import	R
Export	R

Project Document Information

The Project Document Information concept applies to this entity.

Arbitrary documents may be attached to the project, for including additional information to supplement the model. If documents also describe information within the model, in case of discrepency the model governs.

Exchange
Import		O
Export		O

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Bridge View
	User Identity	Bridge View
	Object Ownership	Bridge View
IfcProject
	Spatial Decomposition	Bridge View
	Project Declaration	Bridge View
	Project Units	Bridge View
	Project Representation Context	Bridge View
	Project Global Positioning	Bridge View
	Object Type Definitions	Bridge View
	Project Document Information	Bridge View

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 Bridge View

Formal representations