IfcProject

BACnet MVD

#### IfcProject

Natural language names

| Projekt
| Project
| Projet

Change log

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.

##### 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:

- 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.

> 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

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 |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

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 in stored - either as addition, deletion or modification.

> IFC4 CHANGE The attribute has been changed to be OPTIONAL.

X

X

3 | Name | 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. | X | X
4 | Description | IfcText | ? | 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).

> IFC4 CHANGE The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.

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).

> IFC4 CHANGE The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.

X

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.

> IFC4 CHANGE The inverse attribute datatype has been added.

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).

> IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.

X

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).

> IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.

X

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 | X
IfcContext

5

ObjectType

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 enumaration.

X

X

6 | LongName | IfcLabel | ? | Long name for the context as used for reference purposes. | X | X
7 | Phase | IfcLabel | ? | Current project phase, or life-cycle phase of this project. Applicable values have to be agreed upon by view definitions or implementer agreements. | X | 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.

> IFC4 CHANGE The attribute has been changed to be optional. Change made with upward compatibility for file based exchange.

X

9

UnitsInContext

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.

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.

> IFC4 CHANGE The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.

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

X

IfcProject

##### Definitions applying to Design Transfer View

Instance diagram

#####

Concept usage

Project Template Definitions

The Project Template Definitions 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="dc465171-eb73-43c3-8439-3bf1ad5c68af" name="IfcProject" status="sample" applicableRootEntity="IfcProject">
<Concepts>
<Concept uuid="f7aa9726-a69e-4dde-b8cb-c6338cb5ad15" name="Project Template Definitions" status="sample" override="false">
<Template ref="d6eddceb-c102-4247-8ec0-24e7d4c5da9b" />
</Concept>
</Concepts>
</ConceptRoot>
`
Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View
IfcProject
| Project Template Definitions | Project Template Definitions | Design Transfer View

##### Definitions applying to BACnet View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View
IfcProject
| Project Template Definitions | Project Template Definitions | Design Transfer View

##### Examples

- Basic unit declaration

##### 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;

EXPRESS-G diagram

`

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