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.

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:

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	C
IfcRoot
1	GlobalId	IfcGloballyUniqueId		Assignment of a globally unique identifier within the entire software world.	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
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
4	Description	IfcText	?	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	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	-		This attribute is out of scope for this model view definition and shall not be set.
6	LongName	-		This attribute is out of scope for this model view definition and shall not be set.
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
8	RepresentationContexts	-		This attribute is out of scope for this model view definition and shall not be set.
9	UnitsInContext	-		This attribute is out of scope for this model view definition and shall not be set.
	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
IfcProject

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.IfcStrippedOptional' IN TYPEOF(Temp)

  )) = 0);
  NoDecomposition : SIZEOF(SELF\IfcObjectDefinition.Decomposes) = 0;
END_ENTITY;

 EXPRESS-G diagram

JSON Specification

public class IfcProject extends IfcContext

{

}

	Projekt
	Project
	Projet