IFC 4.3.x development

6.4.3.1 IfcAsset

Change log

IFC4

deletions where_rules WR1
modificationsattributes AssetID is_optional Changed from False to True
modificationsattributes AssetID name Changed from AssetID to Identification
modificationsattributes CurrentValue is_optional Changed from False to True
modificationsattributes DepreciatedValue is_optional Changed from False to True
modificationsattributes IncorporationDate definition Changed from IfcCalendarDate to IfcDate
modificationsattributes IncorporationDate is_optional Changed from False to True
modificationsattributes OriginalValue is_optional Changed from False to True
modificationsattributes Owner is_optional Changed from False to True
modificationsattributes ResponsiblePerson is_optional Changed from False to True
modificationsattributes TotalReplacementCost is_optionalChanged from False to True
modificationsattributes User is_optional Changed from False to True

6.4.3.1.1 Semantic definitions at the entity

An asset is a uniquely identifiable grouping of elements acting as a single entity that has a financial value or that can be operated on as a single unit.

An asset is generally the level of granularity at which maintenance operations are undertaken. An asset is a group that can contain one or more elements. Whilst the financial value of a component or element can be defined, financial value is also defined for accounting purposes at the level of the asset.

There are a number of actors that can be associated with an asset, each actor having a role. Actors within the scope of the project are indicated using the IfcRelAssignsToActor relationship in which case roles should be defined through the IfcActorRole class; otherwise principal actors are identified as attributes of the class. In the existence of both, direct attributes take precedence.

There are a number of costs that can be associated with an asset, each cost having a role. These are specified through the OriginalValue, CurrentValue, TotalReplacementCost and DepreciatedValue attributes.

HISTORY  New entity in IFC2x.

IFC4 CHANGE  All attributes made optional and date values changed to use IfcDate.

6.4.3.1.1 Attributes

# Attribute Type Description
IfcRoot
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,

> NOTE  only the last modification in stored - either as addition, deletion or modification.

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

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

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

> IFC4 CHANGE  The inverse attribute datatype has been added.
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 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.
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 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.
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.
IfcObject
5 ObjectType OPTIONAL IfcLabel The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.
IsDeclaredBy SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.

> IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
Declares SET [0:?] OF IfcRelDefinesByObject FOR RelatingObject Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.

> IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
IsTypedBy SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.

> IFC4 CHANGE  New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange.
IsDefinedBy SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjectsSet of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.

> IFC4 CHANGE  The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.
IfcGroup
IsGroupedBy SET [0:?] OF IfcRelAssignsToGroup FOR RelatingGroup Reference to the relationship IfcRelAssignsToGroup that assigns the one to many group members to the IfcGroup object.

> IFC4 CHANGE  The cardinality has been changed from 1..1 to 0..? in order to allow the exchange of a group concept without having already group members assigned. It now also allows the use of many instances of IfcRelAssignsToGroup to assign the group members. The change has been done with upward compatibility for file based exchange.
IfcAsset
6 Identification OPTIONAL IfcIdentifier A unique identification assigned to an asset that enables its differentiation from other assets.

> NOTE  The asset identifier is unique within the asset register. It differs from the globally unique id assigned to the instance of an entity populating a database.
7 OriginalValue OPTIONAL IfcCostValue The cost value of the asset at the time of purchase.
8 CurrentValue OPTIONAL IfcCostValue The current cost value of the asset.
9 TotalReplacementCostOPTIONAL IfcCostValue The total cost of replacement of the asset.
10 Owner OPTIONAL IfcActorSelect The name of the person or organization that 'owns' the asset.
11 User OPTIONAL IfcActorSelect The name of the person or organization that 'uses' the asset.
12 ResponsiblePerson OPTIONAL IfcPerson The person designated to be responsible for the asset.

> NOTE  In some regulations (for example, UK Health and Safety at Work Act, Electricity at Work Regulations), management of assets must have a person identified as being responsible and to whom regulatory, insurance and other organizations communicate. In places where there is not a legal requirement, the responsible person would be the asset manager but would not have a legal status.
13 IncorporationDate OPTIONAL IfcDate The date on which an asset was incorporated into the works, installed, constructed, erected or completed.

> NOTE  This is the date on which an asset is considered to start depreciating.

> IFC4 CHANGE  Type changed from IfcDateTimeSelect.
14 DepreciatedValue OPTIONAL IfcCostValue The current value of an asset within the accounting rules and procedures of an organization.

6.4.3.1.2 Entity inheritance

dot_inheritance IfcAsset IfcAsset IfcGroup IfcGroup IfcAsset->IfcGroup IfcGroup_children 4 more... IfcGroup_children->IfcGroup IfcObject IfcObject IfcGroup->IfcObject IfcObject_children 5 more... IfcObject_children->IfcObject IfcObjectDefinition IfcObjectDefinition IfcObject->IfcObjectDefinition IfcContext IfcContext IfcContext->IfcObjectDefinition IfcRoot IfcRoot IfcObjectDefinition->IfcRoot IfcTypeObject IfcTypeObject IfcTypeObject->IfcObjectDefinition IfcPropertyDefinition IfcPropertyDefinition IfcPropertyDefinition->IfcRoot IfcRelationship IfcRelationship IfcRelationship->IfcRoot

6.4.3.1.3 Definitions applying to General Usage

6.4.3.1.3.1 Classification

The operating function of an asset within an organization may be particularly valuable in situations where one organization provides and maintains core services and another organization adds and maintains terminal services. It can classify who owns and is responsible for the asset. Operating function can be designated through the use of one or more classification references.

6.4.3.1.3.2 Classification Association

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.

6.4.3.1.3.3 Group Assignment

6.4.3.1.3.4 Identity

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

6.4.3.1.3.5 Object Predefined Type

6.4.3.1.3.6 Object Typing

Any object occurrence can be typed by being assigned to a common object type utilizing this concept. A particular rule, restricting the applicable subtypes of IfcTypeObject that can be assigned, is introduced by overriding this concept at the level of subtypes of IfcObject.

6.4.3.1.3.7 Object User Identity

An attribute Name and optionally Description can be used for all subypes of IfcObject. For those subtypes, that have an object type definition, such as ifcBeam - IfcBeamType, the common Name and optionally Description is associated with the object type.

6.4.3.1.3.8 Property Sets for Objects

PsetName
'Pset_Asset'

6.4.3.1.3.9 Property Sets with Override

Any object occurrence can hold property sets, either directly at the object occurrence as element specific property sets, or at the object type, as type property sets. In this case, the properties that are provided to the object occurrence are the combinations of element specific and type properties. In case, that the same property (within the same property set, is defined both, in occurrence and type properties, the property value of the occurrence property overrides the property value of the type property.

6.4.3.1.3.10 Revision Control

Ownership, history, and merge state is captured using IfcOwnerHistory.

6.4.3.1.4 Formal representations

ENTITY IfcAsset
 SUBTYPE OF (IfcGroup);
	Identification : OPTIONAL IfcIdentifier;
	OriginalValue : OPTIONAL IfcCostValue;
	CurrentValue : OPTIONAL IfcCostValue;
	TotalReplacementCost : OPTIONAL IfcCostValue;
	Owner : OPTIONAL IfcActorSelect;
	User : OPTIONAL IfcActorSelect;
	ResponsiblePerson : OPTIONAL IfcPerson;
	IncorporationDate : OPTIONAL IfcDate;
	DepreciatedValue : OPTIONAL IfcCostValue;
END_ENTITY;