IFC (IFC4X3_ADD2) under development IfcRelAssignsToProcess Semantic definition

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.

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. Entity inheritance 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.

IfcRelAssigns (2)
5 RelatedObjects SET [1:?] OF IfcObjectDefinition

Related objects, which are assigned to a single object. The type of the single (or relating) object is defined in the subtypes of IfcRelAssigns.

6 RelatedObjectsType OPTIONAL IfcStrippedOptional

Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects.

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IfcRelAssignsToProcess (2)
7 RelatingProcess IfcProcessSelect

Reference to the process to which the objects are assigned to.

8 QuantityInProcess OPTIONAL IfcMeasureWithUnit

Quantity of the object specific for the operation by this process.

Table Formal propositions

Name Description

The instance to with the relation points as provided by RelatingProcess shall not be contained in the set of RelatedObjects.

SIZEOF(QUERY(Temp <* SELF\IfcRelAssigns.RelatedObjects | RelatingProcess :=: Temp)) = 0
Table 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.

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Table Formal representation

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

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