IFC 4.3.x development

5.1.3.27 IfcRelAssignsToProcess

Change log

IFC4

additions where_rules NoSelfReference
deletions where_rules WR1
modificationsattributes RelatingProcess definitionChanged from IfcProcess to IfcProcessSelect

5.1.3.27.1 Semantic definitions at the entity

The objectified relationship IfcRelAssignsToProcess handles the assignment of one or many objects to a process or activity. An object can be a product that is the item the process operates on. Processes and activities can operate on things other than products, and can operate in ways other than input and output.

EXAMPLE  It may be common to define processes during estimating or scheduling that describe design tasks (resulting in documents), procurement tasks (resulting in construction materials), planning tasks (resulting in processes), etc. Furthermore, the ways in which process can operate on something might include "installs", "finishes", "transports", "removes", etc. The ways are described as operation types.

The inherited attribute RelatedObjects gives the references to the objects, or object type, which the process operates on. The RelatingProcess is the process or process type, that operates on the object. The operation types are captured in the inherited attribute Name.

NOTE  The agreement on valid and recognizable values for the Name attribute is part of view definitions and implementer agreements.

HISTORY  New entity in IFC1.5. Has been renamed from IfcRelProcessOperatesOn in IFC2x.

IFC4 CHANGE  The data type RelatingProcess has been extended to cover also IfcTypeProcess

5.1.3.27.1 Attributes

#Attribute Type Description
IfcRoot
1GlobalId IfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world.
2OwnerHistory 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.
3Name 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.
4Description OPTIONAL IfcText Optional description, provided for exchanging informative comments.
IfcRelationship
IfcRelAssigns
5RelatedObjects SET [1:?] OF IfcObjectDefinitionRelated objects, which are assigned to a single object. The type of the single (or relating) object is defined in the subtypes of IfcRelAssigns.
6RelatedObjectsTypeOPTIONAL IfcObjectTypeEnum Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects.

> IFC4 CHANGE  The attribute is deprecated and shall no longer be used. A NIL value should always be assigned.
IfcRelAssignsToProcess
7RelatingProcess IfcProcessSelect Reference to the process to which the objects are assigned to.

> IFC4 CHANGE Datatype expanded to include IfcProcess and IfcTypeProcess.
8QuantityInProcess OPTIONAL IfcMeasureWithUnit Quantity of the object specific for the operation by this process.

5.1.3.27.2 Entity inheritance

dot_inheritance IfcRelAssignsToProcess IfcRelAssignsToProcess IfcRelAssigns IfcRelAssigns IfcRelAssignsToProcess->IfcRelAssigns IfcRelAssigns_children 5 more... IfcRelAssigns_children->IfcRelAssigns IfcRelationship IfcRelationship IfcRelAssigns->IfcRelationship IfcRelationship_children 5 more... IfcRelationship_children->IfcRelationship IfcRoot IfcRoot IfcRelationship->IfcRoot IfcObjectDefinition IfcObjectDefinition IfcObjectDefinition->IfcRoot IfcPropertyDefinition IfcPropertyDefinition IfcPropertyDefinition->IfcRoot

5.1.3.27.3 Definitions applying to General Usage

5.1.3.27.3.1 Identity

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

5.1.3.27.3.2 Revision Control

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

5.1.3.27.4 Formal representations

ENTITY IfcRelAssignsToProcess
 SUBTYPE OF (IfcRelAssigns);
	RelatingProcess : IfcProcessSelect;
	QuantityInProcess : OPTIONAL IfcMeasureWithUnit;
 WHERE
	NoSelfReference : SIZEOF(QUERY(Temp <* SELF\IfcRelAssigns.RelatedObjects | RelatingProcess :=: Temp)) = 0;
END_ENTITY;