![]() | Projekt |
![]() | Project |
![]() | Projet |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcProject | ||||
OwnerHistory | MODIFIED | Instantiation changed to OPTIONAL. | ||
RepresentationContexts | MODIFIED | Instantiation changed to OPTIONAL. | ||
UnitsInContext | MODIFIED | Instantiation changed to OPTIONAL. |
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:
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. |
# | 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 |
Spatial Decomposition
The Spatial Decomposition concept applies to this entity as shown in Table 1.
| ||||
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 | ![]() |
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Import | R | |||
Export | R |
Project Declaration
The Project Declaration concept applies to this entity as shown in Table 2.
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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 | ![]() |
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Import | O | R | R | |
Export | O | R | R |
Project Units
The Project Units concept applies to this entity as shown in Table 3.
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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 | ![]() |
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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.
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Table 4 — IfcProject Project Representation Context |
Exchange | ![]() |
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Import | R | R | R | R |
Export | R | R | R | R |
Project Global Positioning
The Project Global Positioning concept applies to this entity.
Exchange | ![]() |
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Import | O | |||
Export | O |
Object Type Definitions
The Object Type Definitions concept applies to this entity as shown in Table 5.
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Table 5 — IfcProject Object Type Definitions |
Exchange | ![]() |
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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 | ![]() |
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Import | O | |||
Export | O |
# | 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 |
<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>
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;