5.1.3.3 IfcContext
ABSTRACT This definition may not be instantiated
5.1.3.3.1 Semantic definition
IfcContext is the generalization of a project context in which objects, type objects, property sets, and properties are defined. The IfcProject as subtype of IfcContext provides the context for all information on a construction project, it may include one or several IfcProjectLibrary's as subtype of IfcContext to register the included libraries for the project. A library of products that is referenced is declared within the IfcProjectLibrary as the context of that library.
Context definitions can be named, using the inherited Name attribute, which should be a user recognizable key or number for the context. The LongName can add a full name. Further explanations to the context can be given using the inherited Description attribute.
A Context is declared by the relationship object IfcRelDeclares that refers to the corresponding objects within the context. More specific relationships are introduced at the level of subtypes.
5.1.3.3.2 Entity inheritance
5.1.3.3.3 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, |
| 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. |
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| 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). |
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| 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). |
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| 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. |
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| 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). |
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| 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). |
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| 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 Click to hide 11 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. |
| 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. |
| 9 | UnitsInContext | OPTIONAL IfcUnitAssignment |
Units globally assigned to measure types used within the context. |
| 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. |
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| Declares | SET [0:?] OF IfcRelDeclares FOR RelatingContext |
Reference to the IfcRelDeclares relationship that assigns the uppermost entities of included hierarchies to this context instance. |
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5.1.3.3.4 Concept usage
| Concept | Usage | Description | |
|---|---|---|---|
| IfcRoot (2) | |||
| Revision Control | General |
Ownership, history, and merge state is captured using IfcOwnerHistory. |
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| Software Identity | General |
IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept. |
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| IfcObjectDefinition (9) | |||
| Classification Association | General |
Any object occurrence or object type can have a reference to a specific classification reference, i.e. to a particular facet within a classification system. |
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| Aggregation | General |
No description available. |
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| Approval Association | General |
No description available. |
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| Constraint Association | General |
No description available. |
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| Document Association | General |
No description available. |
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| Library Association | General |
No description available. |
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| Material Association | General |
No description available. |
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| Material Single | General |
No description available. |
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| Nesting | General |
No description available. |
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| Click to show 11 hidden inherited concepts Click to hide 11 inherited concepts | |||
| IfcContext (7) | |||
| Project Classification Information | General |
No description available. |
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| Project Context | General |
No description available. |
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| Project Document Information | General |
No description available. |
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| Project Library Information | General |
No description available. |
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| Project Representation Context 3D | General |
No description available. |
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| Project Template Definitions | General |
No description available. |
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| Project Type Definitions | General |
No description available. |
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5.1.3.3.5 Formal representation
ENTITY IfcContext
ABSTRACT SUPERTYPE OF (ONEOF
(IfcProject
,IfcProjectLibrary))
SUBTYPE OF (IfcObjectDefinition);
ObjectType : OPTIONAL IfcLabel;
LongName : OPTIONAL IfcLabel;
Phase : OPTIONAL IfcLabel;
RepresentationContexts : OPTIONAL SET [1:?] OF IfcRepresentationContext;
UnitsInContext : OPTIONAL IfcUnitAssignment;
INVERSE
IsDefinedBy : SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjects;
Declares : SET [0:?] OF IfcRelDeclares FOR RelatingContext;
END_ENTITY;