IFC 4.3.0.1 (IFC4X3) development

5.1.3.9 IfcProcess

ABSTRACT This definition may not be instantiated

5.1.3.9.1 Semantic definition

IfcProcess is defined as one individual activity or event, that is ordered in time, that has sequence relationships with other processes, which transforms input in output, and may connect to other other processes through input output relationships. An IfcProcess can be an activity (or task), or an event. It takes usually place in building construction with the intent of designing, costing, acquiring, constructing, or maintaining products or other and similar tasks or procedures. Figure 5.1.3.9.A illustrates process relationships.

icom diagram
Figure 5.1.3.9.A — Process relationships and the ICOM process diagram.

Process information relates to other objects by establishing the following relationships:

  • Nesting of processes : IfcRelNests - A process can contain sub processes and thereby be nested.
  • Sequencing of processes : IfcRelSequence - Processes can be placed in sequence (including overlapping for parallel tasks), and have predecessors and successors.
  • Assigning process to schedules : IfcRelAssignsToControl - Activities such as tasks, and predominately summary tasks, are assigned to a work schedule.
  • Having a product assigned to the process as input : IfcRelAssignsToProcess - Products can be assigned as input to a process, such as for construction process planning.
  • Having a product assigned to the process as output : IfcRelAssignsToProduct - Products can be assigned as output to a process, such as for construction process planning.
  • Having a control assigned to the process as process control : IfcRelAssignsToProcess - Items that act as a control onto the process can be assigned to a process, such as for cost management (a cost item assigned to a work task).
  • Having a resource assigned to the process as consumed by the process : IfcRelAssignsToProcess - Items that act as a mechanism to a process, such as labor, material and equipment in cost calculations.

5.1.3.9.2 Entity inheritance

5.1.3.9.3 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.

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).

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).

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.

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).

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).

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)
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.

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.

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.

IsDefinedBy SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjects

Set 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.

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IfcProcess (5)
6 Identification OPTIONAL IfcIdentifier

An identifying designation given to a process or activity. It is the identifier at the occurrence level.

7 LongDescription OPTIONAL IfcText

An extended description or narrative that may be provided.

IsPredecessorTo SET [0:?] OF IfcRelSequence FOR RelatingProcess

Dependency between two activities, it refers to the subsequent activity for which this activity is the predecessor. The link between two activities can include a link type and a lag time.

IsSuccessorFrom SET [0:?] OF IfcRelSequence FOR RelatedProcess

Dependency between two activities, it refers to the previous activity for which this activity is the successor. The link between two activities can include a link type and a lag time.

OperatesOn SET [0:?] OF IfcRelAssignsToProcess FOR RelatingProcess

Set of relationships to other objects, e.g. products, processes, controls, resources or actors, that are operated on by the process.

Table 5.1.3.9.B

5.1.3.9.4 Property sets

  • Pset_Risk
    • RiskName
    • RiskType
    • NatureOfRisk
    • RiskAssessmentMethodology
    • UnmitigatedRiskLikelihood
    • UnmitigatedRiskConsequence
    • UnmitigatedRiskSignificance
    • MitigationPlanned
    • MitigatedRiskLikelihood
    • MitigatedRiskConsequence
    • MitigatedRiskSignificance
    • MitigationProposed
    • AssociatedProduct
    • AssociatedActivity
    • AssociatedLocation

5.1.3.9.5 Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

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

Software Identity General

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

IfcObjectDefinition (9)
Aggregation General

No description available.

Approval Association General

No description available.

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.

Constraint Association General

No description available.

Document Association General

No description available.

Library Association General

No description available.

Material Association General

No description available.

Material Single General

No description available.

Nesting General

No description available.

IfcObject (5)
Assignment to Group General

No description available.

Object Predefined Type General

No description available.

Object Typing General

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.

This concept can be applied to the following resources:

Object User Identity General

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.

Property Sets with Override General

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.

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IfcProcess (4)
Object Typing General

This concept can be applied to the following resources:

Process Assignment General

No description available.

Property Sets for Objects General

This concept can be applied to the following resources:

Sequential Connectivity General

No description available.

Table 5.1.3.9.C

5.1.3.9.6 Formal representation

ENTITY IfcProcess
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcEvent
	,IfcProcedure
	,IfcTask))
 SUBTYPE OF (IfcObject);
	Identification : OPTIONAL IfcIdentifier;
	LongDescription : OPTIONAL IfcText;
 INVERSE
	IsPredecessorTo : SET [0:?] OF IfcRelSequence FOR RelatingProcess;
	IsSuccessorFrom : SET [0:?] OF IfcRelSequence FOR RelatedProcess;
	OperatesOn : SET [0:?] OF IfcRelAssignsToProcess FOR RelatingProcess;
END_ENTITY;

5.1.3.9.7 References

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5.1.3.9.8 Changelog

  • attribute, Identification
  • attribute, LongDescription