5.1.3.11 IfcProject

RV ⓘ

AbV ⓘ

5.1.3.11.1 Semantic definition

IfcProject establishes the context for information to be exchanged or shared, and it may represent a construction project but does not have to. The IfcProject's main purpose in an exchange structure is to provide the root instance and the context for all other information items included.

The context provided by the IfcProject includes:

the default units
the geometric representation context for exchange structures including shape representations
the project coordinate system
the coordinate space dimension
the precision used within the geometric representations
optionally the indication of the true north
optionally the map conversion between the project coordinate system and the geospatial coordinate reference system.

Formal Propositions

There shall be at most one project within the exchange context. This is enforced by the global rule IfcSingleProjectInstance.

5.1.3.11.2 Entity inheritance

5.1.3.11.3 Attributes

#	Attribute	Type	Description
IfcRoot (4)
1	GlobalId	IfcGloballyUniqueId	Assignment of a globally unique identifier within the entire software world.
2	OwnerHistory	OPTIONAL IfcOwnerHistory	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 is stored - either as addition, deletion or modification. IFC4-CHANGE The attribute has been changed to be OPTIONAL.
3	Name	OPTIONAL IfcLabel	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.
4	Description	OPTIONAL IfcText	Optional description, provided for exchanging informative comments.
IfcObjectDefinition (7)
	HasAssignments	SET [0:?] OF IfcRelAssigns FOR RelatedObjects	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.
	Nests	SET [0:1] OF IfcRelNests FOR RelatedObjects	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 structures only). IFC4-CHANGE The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.
	IsNestedBy	SET [0:?] OF IfcRelNests FOR RelatingObject	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). IFC4-CHANGE The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.
	HasContext	SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions	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. IFC4-CHANGE The inverse attribute datatype has been added.
	IsDecomposedBy	SET [0:?] OF IfcRelAggregates FOR RelatingObject	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 definition can be aggregated by several other objects (occurrences or parts). IFC4-CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
	Decomposes	SET [0:1] OF IfcRelAggregates FOR RelatedObjects	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 definition can only be part of a single decomposition (to allow hierarchical structures only). IFC4-CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
	HasAssociations	SET [0:?] OF IfcRelAssociates FOR RelatedObjects	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.
Click to show 11 hidden inherited attributes
IfcContext (7)
5	ObjectType	OPTIONAL IfcLabel	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 enumeration.
6	LongName	OPTIONAL IfcLabel	Long name for the context as used for reference purposes.
7	Phase	OPTIONAL IfcLabel	Current project phase, or life-cycle phase of this project. Applicable values have to be agreed upon by view definitions or implementer agreements.
8	RepresentationContexts	OPTIONAL SET [1:?] OF IfcRepresentationContext	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. IFC4-CHANGE The attribute has been changed to be optional. Change made with upward compatibility for file based exchange.
9	UnitsInContext	OPTIONAL IfcUnitAssignment	Units globally assigned to measure types used within the context. IFC4-CHANGE The attribute has been changed to be optional. Change made with upward compatibility for file based exchange.
	IsDefinedBy	SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjects	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. IFC4-CHANGE The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.
	Declares	SET [0:?] OF IfcRelDeclares FOR RelatingContext	Reference to the IfcRelDeclares relationship that assigns the uppermost entities of included hierarchies to this context instance. NOTE The spatial hierarchy is assigned to IfcProject using the IfcRelAggregates relationship. This is a single exception due to compatibility reasons with earlier releases.

Table 5.1.3.11.A

5.1.3.11.4 Formal propositions

Name Description

CorrectContext

If a RepresentationContexts relation is provided then there shall be no instance of IfcGeometricRepresentationSubContext directly included in the set of RepresentationContexts.

 NOT(EXISTS(SELF\IfcContext.RepresentationContexts)) OR
(SIZEOF(QUERY(Temp <* SELF\IfcContext.RepresentationContexts |
 'IFC4X3_DEV_738df036.IFCGEOMETRICREPRESENTATIONSUBCONTEXT' IN TYPEOF(Temp)
  )) = 0)

HasName

The Name attribute has to be provided for IfcProject. It is the short name for the project.

EXISTS(SELF\IfcRoot.Name)

NoDecomposition

The IfcProject represents the root of the any decomposition tree. It shall therefore not be used to decompose any other object definition.

SIZEOF(SELF\IfcObjectDefinition.Decomposes) = 0

Table 5.1.3.11.C

5.1.3.11.5 Property sets

Pset_ProjectCommon
- ProjectType
- ProjectInvestmentEstimate
- FundingSource
- ROI
- NetEarnedValue
- PaybackPeriod

5.1.3.11.6 Concept usage

project relationships — Figure 5.1.3.11.B — Project spatial and work plan structure

spatial decomposition relationships — Figure 5.1.3.11.B — Project spatial and work plan structure

5.1.3.11.7 Formal representation

 ENTITY IfcProject
 SUBTYPE OF (IfcContext);
 WHERE
	CorrectContext : NOT(EXISTS(SELF\IfcContext.RepresentationContexts)) OR
(SIZEOF(QUERY(Temp <* SELF\IfcContext.RepresentationContexts |
 'IFC4X3_DEV_738df036.IFCGEOMETRICREPRESENTATIONSUBCONTEXT' IN TYPEOF(Temp)
  )) = 0);
	HasName : EXISTS(SELF\IfcRoot.Name);
	NoDecomposition : SIZEOF(SELF\IfcObjectDefinition.Decomposes) = 0;
END_ENTITY;