IfcObjective

Definition from IAI: An IfcObjective captures qualitative information for an objective-based constraint.

HISTORY: New Entity in IFC Release 2.0

Use Definition

IfcObjective is a subtype of IfcConstraint and may be associated with any subtype of IfcObject through the IfcRelAssociatesConstraint relationship in the IfcControlExtension schema.

The aim of IfcObjective is to specify the purpose for which the constraint is applied and to capture the values of the constraint. These may be both the benchmark values that are intended to indicate the constraint extent and the resulting values in use that enable performance comparisons to be applied.

EXPRESS specification:

ENTITY IfcObjective

SUBTYPE OF (

IfcConstraint);

BenchmarkValues

OPTIONAL IfcMetric;

ResultValues

OPTIONAL IfcMetric;

ObjectiveQualifier

IfcObjectiveEnum;

UserDefinedQualifier

OPTIONAL IfcLabel;

WHERE

WR21

(ObjectiveQualifier <> IfcObjectiveEnum.USERDEFINED) OR ((ObjectiveQualifier = IfcObjectiveEnum.USERDEFINED) AND EXISTS(SELF\IfcObjective.UserDefinedQualifier));

END_ENTITY;

Attribute definitions:

BenchmarkValues	:	A list of any benchmark values used for comparison purposes.
ResultValues	:	A list of any resultant values used for comparison purposes.
ObjectiveQualifier	:	Enumeration that qualifies the type of objective constraint.
UserDefinedQualifier	:	A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type IfcObjectiveEnum has value USERDEFINED.

Formal Propositions:

WR21

The attribute UserDefinedQualifier must be asserted when the value of the IfcObjectiveEnum is set to USERDEFINED.

Inheritance graph

ENTITY IfcObjective;

ENTITY IfcConstraint;

Name

IfcLabel;

Description

OPTIONAL IfcText;

ConstraintGrade

IfcConstraintEnum;

ConstraintSource

OPTIONAL IfcLabel;

CreatingActor

OPTIONAL IfcActorSelect;

CreationTime

OPTIONAL IfcDateTimeSelect;

UserDefinedGrade

OPTIONAL IfcLabel;

INVERSE

ClassifiedAs

SET OF IfcConstraintClassificationRelationship FOR ClassifiedConstraint;

RelatesConstraints

SET OF IfcConstraintRelationship FOR RelatingConstraint;

IsRelatedWith

SET OF IfcConstraintRelationship FOR RelatedConstraints;

PropertiesForConstraint

SET OF IfcPropertyConstraintRelationship FOR RelatingConstraint;

Aggregates

SET OF IfcConstraintAggregationRelationship FOR RelatingConstraint;

IsAggregatedIn

SET OF IfcConstraintAggregationRelationship FOR RelatedConstraints;

ENTITY IfcObjective;

BenchmarkValues

OPTIONAL IfcMetric;

ResultValues

OPTIONAL IfcMetric;

ObjectiveQualifier

IfcObjectiveEnum;

UserDefinedQualifier

OPTIONAL IfcLabel;

END_ENTITY;