IFC 4.3.x development

7.3.3.1 IfcConstructionEquipmentResource

Change log

IFC4

additionsattributes PredefinedType
additionswhere_rulesCorrectPredefinedType

7.3.3.1.1 Semantic definitions at the entity

IfcConstructionEquipmentResource is usage of construction equipment to assist in the performance of construction. Construction Equipment resources are wholly or partially consumed or occupied in the performance of construction.

HISTORY  New entity in IFC2.0.

Occurrences of IfcConstructionEquipmentResource are products that are used as resources to assist the process of construction. More specifically, they are products that are standalone items brought to a project to fulfil a particular purpose. Examples might be a tower crane or other mobile crane, a screwing machine, or a lifting hoist.

Instances of any subtype of IfcProduct may be assigned to the equipment resource using IfcRelAssignsToResource in order to characterize the equipment further, as described at the supertype IfcResource. Examples of relevant subtypes of IfcProduct are IfcTransportElement, IfcDiscreteAccessory, or IfcProxy (for particular cases where more precise usage details are not available)

7.3.3.1.1 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.
HasAssociationsSET [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.
IfcResource
6 Identification OPTIONAL IfcIdentifier An identifying designation given to a resource.

It is the identifier at the occurrence level.



> IFC4 CHANGE Attribute promoted from subtype IfcConstructionResource.
7 LongDescriptionOPTIONAL IfcText A detailed description of the resource (e.g. the skillset for a labor resource).

> IFC4 CHANGE  The attribute LongDescription is added replacing the ResourceGroup attribute at subtype IfcConstructionResource.
ResourceOf SET [0:?] OF IfcRelAssignsToResource FOR RelatingResourceSet of relationships to other objects, e.g. products, processes, controls, resources or actors, for which this resource object is a resource.
IfcConstructionResource
8 Usage OPTIONAL IfcResourceTime Indicates the work, usage, and times scheduled and completed. Some attributes on this object may have associated constraints or time series; see documentation of IfcResourceTime for specific usage. If the resource is nested, then certain values may be calculated based on the component resources as indicated at IfcResourceTime.

> IFC4 CHANGE  New attribute.
9 BaseCosts OPTIONAL LIST [1:?] OF IfcAppliedValue Indicates the unit costs for which accrued amounts should be calculated. Such unit costs may be split into Name designations (for example, 'Standard', 'Overtime'), and may contain a hierarchy of cost values that apply at different dates (using _IfcCostValue.ApplicableDate_ and _IfcCostValue.FixedUntilDate_).

> IFC4 CHANGE  New attribute.
10 BaseQuantity OPTIONAL IfcPhysicalQuantity Identifies the base quantity consumed of the resource relative to assignments.

For crew, labour, subcontract, and equipment resources, this refers to IfcQuantityTime.

For material resources, this refers to IfcQuantityVolume.

For product resources, this refers to IfcQuantityCount.

> IFC4 CHANGE  New attribute.
IfcConstructionEquipmentResource
11 PredefinedType OPTIONAL IfcConstructionEquipmentResourceTypeEnum Defines types of construction equipment resources.

> IFC4 New attribute.

7.3.3.1.2 Entity inheritance

dot_inheritance IfcConstructionEquipmentResource IfcConstructionEquipmentResource IfcConstructionResource IfcConstructionResource IfcConstructionEquipmentResource->IfcConstructionResource IfcConstructionResource_children 5 more... IfcConstructionResource_children->IfcConstructionResource IfcResource IfcResource IfcConstructionResource->IfcResource IfcObject IfcObject IfcResource->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

7.3.3.1.3 Definitions applying to General Usage

7.3.3.1.3.1 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.

7.3.3.1.3.2 Constraint

Constraints may be applied to a resource to indicate fixed work (such as total person-hours) or fixed usage (such as simultaneous workers).

7.3.3.1.3.3 Document

Documents may be published for work plans consisting of schedules, calendars, tasks, and resources. The relationship IfcRelAssociatesDocument may be used to preserve mappings to such document where RelatingDocument points to an IfcDocumentReference and RelatedObjects includes the IfcConstructionResource as shown in Figure 184. IfcDocumentReference.ItemReference identifies the resource within the scope of the document, such as an integer or guid. The IfcDocumentReference.ReferencedDocument corresponds to the document which is uniquely identified by IfcDocumentInformation.DocumentId and/or IfcDocumentInformation.PublicationLocation. Such document mapping allows items in the document to be updated from the building information model and vice-versa.

Document Use Definition

Figure 331 — Construction resource document use

7.3.3.1.3.4 Identity

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

7.3.3.1.3.5 Nesting

Resources may be decomposed into allocation pools using the IfcRelNests relationship as shown in Figure 181. For example, an IfcLaborResource for "Electrician" may be decomposed into three task-specific IfcLaborResource objects: "Electrical Rough-in", "First Floor Circuits", and "Second Floor Circuits". Both relating and related sides may represent the same ResourceTime.ScheduleUsage quantity (for example, 6 workers time-shared), or the related side may break out ResourceTime.ScheduleUsage quantities for reserved use (for example, 4 workers and 2 workers).

A common scenario is two nesting levels where the first-level resources have no task assignments; while second-level resources have specific task assignments indicating that the resource is subdivided into allocations for specific tasks. While the model allows unlimited nesting of resources, implementer agreements may restrict to two nesting levels with task assignments specifically at the second level.

Composition Use Definition

Figure 334 — Construction resource composition use

Type
'IfcConstructionResource'

7.3.3.1.3.6 Object Predefined Type

7.3.3.1.3.7 Object Typing

RelatingType
'IfcConstructionEquipmentResourceType'
'IfcConstructionResourceType'

7.3.3.1.3.8 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.

7.3.3.1.3.9 Property Sets for Objects

For time series properties as shown in Figure 180, each IfcTimeSeriesValue indicates a LIST of values, where the sequence of the value corresponds to the IfcCostValue at IfcConstructionResource.CostRatesConsumed. For example, if CostRatesConsumed has two IfcCostValue items in the LIST, "Standard" and "Overtime", then IfcTimeSeriesValue(IfcDuration('T8H0M0S'),IfcDuration('T2H0M0S')) would indicate 8 hours at Standard rate and 2 hours at Overtime rate. If the list of values at IfcTimeSeriesValue.ListValues is less than the size of CostRatesConsumed, then subsequent values are considered to be zero.

Time Series Use Definition

Figure 333 — Construction resource time series use

PsetName
'Pset_ConstructionResource'

7.3.3.1.3.10 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.

7.3.3.1.3.11 Quantity Sets

QsetName
'Qto_ConstructionEquipmentResourceBaseQuantities'
'Qto_ConstructionEquipmentResourceBaseQuantities'

7.3.3.1.3.12 Resource Assignment

Type
'IfcTransportElement'

7.3.3.1.3.13 Resource Cost

ValueType CostType CostName
'IfcMonetaryMeasure''IfcCostValue''Usage'
'IfcMonetaryMeasure''IfcCostValue''Operation'
'IfcMonetaryMeasure''IfcCostValue''Deployment'

7.3.3.1.3.14 Resource Quantity

QuantityName QuantityType
'Operation' 'IfcQuantityTime'

7.3.3.1.3.15 Revision Control

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

7.3.3.1.4 Formal representations

ENTITY IfcConstructionEquipmentResource
 SUBTYPE OF (IfcConstructionResource);
	PredefinedType : OPTIONAL IfcConstructionEquipmentResourceTypeEnum;
 WHERE
	CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR 
 (PredefinedType <> IfcConstructionEquipmentResourceTypeEnum.USERDEFINED) OR 
 ((PredefinedType = IfcConstructionEquipmentResourceTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
END_ENTITY;