IfcProject

Natural language names
deProjekt
enProject
frProjet
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcProject
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      RepresentationContextsMODIFIEDInstantiation changed to OPTIONAL.
      UnitsInContextMODIFIEDInstantiation changed to OPTIONAL.
Semantic definitions at the entity
Entity definition

IfcProject indicates the undertaking of some design, engineering, construction, or maintenance activities leading towards a product. The project 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:

HISTORY  New entity in IFC1.0
IFC4 CHANGE  The attributes RepresentationContexts and UnitsInContext are made optional and are promoted to supertype IfcContext.

Informal Propositions:

  1. There shall only be one project within the exchange context. This is enforced by the global rule IfcSingleProjectInstance.
Formal Propositions
RuleDescription
HasNameThe Name attribute has to be provided for IfcProject. It is the short name for the project.
CorrectContextIf a RepresentationContexts relation is provided then there shall be no instance of IfcGeometricRepresentationSubContext directly included in the set of RepresentationContexts.
NoDecompositionThe 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 IfcContext IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? 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
4DescriptionIfcText? Optional description, provided for exchanging informative comments.X
IfcObjectDefinition
HasAssignmentsIfcRelAssigns
@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
NestsIfcRelNests
@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).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.
X
IsNestedByIfcRelNests
@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).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.
X
HasContextIfcRelDeclares
@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.
IFC4 CHANGE  The inverse attribute datatype has been added.
X
IsDecomposedByIfcRelAggregates
@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).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
DecomposesIfcRelAggregates
@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).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
HasAssociationsIfcRelAssociates
@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
5ObjectTypeIfcLabel? 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
6LongNameIfcLabel? Long name for the context as used for reference purposes.X
7PhaseIfcLabel? Current project phase, or life-cycle phase of this project. Applicable values have to be agreed upon by view definitions or implementer agreements. X
8RepresentationContextsIfcRepresentationContext? 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.
IFC4 CHANGE  The attribute has been changed to be optional. Change made with upward compatibility for file based exchange.
X
9UnitsInContextIfcUnitAssignment? 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.
X
IsDefinedByIfcRelDefinesByProperties
@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.
IFC4 CHANGE  The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.
X
DeclaresIfcRelDeclares
@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 General Usage

 Instance diagram


Concept usage

Spatial Decomposition

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

RelatedObjectsSpatialElementNameDescription
 If referenced, the site is the root of the spatial structure.

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.

Figure 125 illustrates project relationships with spatial structures, elements, and element type libraries.

spatial decomposition relationships

Figure 125 — Project spatial structure, products and product type library



Project Declaration

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

TypeDescription
IfcProjectLibraryReferenced projects incorporated into this project.
IfcPropertySetTemplateProperty set templates defined by this project.
IfcTypeObjectType definition defined by this project.
IfcActorActors participating in this project.
IfcControlControls issued within this project.
IfcGroupGroups defined by this project.
IfcProcessProcesses defined by this project.
IfcResourceResources 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 126 illustrates the use of IfcProject as context for work plans or work schedules.

project relationships

Figure 126 — Project spatial and work plan structure



Project Units

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

HasUnitsDerivedUnitTypeSIUnitTypeSIUnitNameConversionUnitTypeConversionUnitNameDescription
 Length unit as meters, millimeters, or inches.

Table 6 — IfcProject Project Units



Project Context

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

ContextIdentifierContextTypeSubContextIdentifierSubContextTypeDescription
Model3D  Context for all 3D geometry.
Plan2D  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.



mvdXML Specification
<?xml version="1.0"?>
<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="f27156e4-5022-4331-a26a-a4b8b83aebb9" name="IfcProject" status="sample" applicableRootEntity="IfcProject">
  <Concepts>
    <Concept uuid="17049e53-9983-47f9-a14f-43b5fc479bab" name="Spatial Decomposition" status="sample" override="false">
      <Template ref="667f8443-ecce-4a8d-a63f-931fab0453e0" />
      <TemplateRules operator="and">
        <TemplateRule Description="If referenced, the site is the root of the spatial structure." Parameters="" />
        <TemplateRule Description="If referenced, the building is the root of the spatial structure (no explicit site information included)." Parameters="" />
        <TemplateRule Description="If referenced, the spatial zone is the root of the spatial structure (to be used as a stub for non-building related projects)." Parameters="" />
      </TemplateRules>
    </Concept>
    <Concept uuid="dbaafd38-9430-4ab3-b1e9-a7a89232b643" name="Project Declaration" status="sample" override="false">
      <Template ref="ab1e2cfd-9f21-4f4a-b6af-cc26d84e45ac" />
      <TemplateRules operator="and">
        <TemplateRule Description="Referenced projects incorporated into this project." Parameters="Type[Value]='IfcProjectLibrary'" />
        <TemplateRule Description="Property set templates defined by this project." Parameters="Type[Value]='IfcPropertySetTemplate'" />
        <TemplateRule Description="Type definition defined by this project." Parameters="Type[Value]='IfcTypeObject'" />
        <TemplateRule Description="Actors participating in this project." Parameters="Type[Value]='IfcActor'" />
        <TemplateRule Description="Controls issued within this project." Parameters="Type[Value]='IfcControl'" />
        <TemplateRule Description="Groups defined by this project." Parameters="Type[Value]='IfcGroup'" />
        <TemplateRule Description="Processes defined by this project." Parameters="Type[Value]='IfcProcess'" />
        <TemplateRule Description="Resources defined by this project." Parameters="Type[Value]='IfcResource'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="dfbc67d4-42c8-4c8c-bdca-22bdc628772a" name="Project Units" status="sample" override="false">
      <Template ref="4ccaac0c-88f8-4c1d-91fd-2214d0e513c4" />
      <TemplateRules operator="and">
        <TemplateRule Description="Length unit as meters, millimeters, or inches." Parameters="" />
        <TemplateRule Description="Angle unit as degrees or radians." Parameters="" />
      </TemplateRules>
    </Concept>
    <Concept uuid="06ef2070-66eb-4829-a416-b03189ae65b7" name="Project Context" status="sample" override="false">
      <Template ref="38dac6f0-997c-4544-9bca-b6326b9a3e4b" />
      <TemplateRules operator="and">
        <TemplateRule Description="Context for all 3D geometry." Parameters="ContextIdentifier[Value]='Model' AND ContextType[Value]='3D'" />
        <TemplateRule Description="Context for all 2D annotations." Parameters="ContextIdentifier[Value]='Plan' AND ContextType[Value]='2D'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="87d78caf-f3d9-49f5-974f-17f1bb457d6a" name="Project Classification Information" status="sample" override="false">
      <Template ref="818ca5a3-4574-49b1-9951-ae7bad5c3341" />
    </Concept>
    <Concept uuid="02ddfc7b-3c41-4466-b80d-4c96999a14c1" name="Project Document Information" status="sample" override="false">
      <Template ref="627f19f8-d2ee-4b19-a13c-e5149018b976" />
    </Concept>
    <Concept uuid="3add55df-1398-463b-8dad-0505b7604a3a" name="Project Library Information" status="sample" override="false">
      <Template ref="f71de28e-4352-4f0d-9830-4fa13534a705" />
    </Concept>
  </Concepts>
</ConceptRoot>
Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
IfcProject
Spatial DecompositionSpatial DecompositionGeneral Usage
Project DeclarationProject DeclarationGeneral Usage
Project UnitsProject UnitsGeneral Usage
Project ContextProject Representation ContextGeneral Usage
Project Classification InformationProject Classification InformationGeneral Usage
Project Document InformationProject Document InformationGeneral Usage
Project Library InformationProject Library InformationGeneral Usage
Examples
Formal representations
XML 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

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