220.127.116.11.1 Semantic definition
An IfcObjective captures qualitative information for an objective-based constraint.
IfcObjective is a subtype of IfcConstraint and may be associated with any subtype of IfcRoot through the IfcRelAssociatesConstraint relationship in the IfcControlExtension schema, or may be associated with IfcProperty by IfcResourceConstraintRelationship.
The aim of IfcObjective is to specify the purpose for which the constraint is applied and to capture the benchmark metrics of the constraint.
18.104.22.168.2 Entity inheritance
A human-readable name to be used for the constraint.
A human-readable description that may apply additional information about a constraint.
Enumeration that qualifies the type of constraint.
Any source material, such as a code or standard, from which the constraint originated.
Person and/or organization that has created the constraint.
Time when information specifying the constraint instance was created.
Allows for specification of user defined grade of the constraint beyond the enumeration values (hard, soft, advisory) provided by ConstraintGrade attribute of type IfcConstraintEnum. When a value is provided for attribute UserDefinedGrade in parallel the attribute ConstraintGrade shall have enumeration value USERDEFINED.
|HasExternalReferences||SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects||
Reference to an external references, e.g. library, classification, or document information, that are associated to the constraint.
|PropertiesForConstraint||SET [0:?] OF IfcResourceConstraintRelationship FOR RelatingConstraint||
Reference to the properties to which the constraint is applied.
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|8||BenchmarkValues||OPTIONAL LIST [1:?] OF IfcConstraint||
A list of nested constraints.
Enumeration that identifies the logical type of aggregation for the benchmark metrics.
Enumeration that qualifies the type of objective constraint.
A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type IfcObjectiveEnum has value USERDEFINED.
22.214.171.124.4 Formal propositions
The attribute UserDefinedQualifier must be asserted when the value of the ObjectiveQualifier is set to USERDEFINED.
126.96.36.199.5 Formal representation
ENTITY IfcObjective SUBTYPE OF (IfcConstraint); BenchmarkValues : OPTIONAL LIST [1:?] OF IfcConstraint; LogicalAggregator : OPTIONAL IfcLogicalOperatorEnum; ObjectiveQualifier : IfcObjectiveEnum; UserDefinedQualifier : OPTIONAL IfcLabel; WHERE WR21 : (ObjectiveQualifier <> IfcObjectiveEnum.USERDEFINED) OR ((ObjectiveQualifier = IfcObjectiveEnum.USERDEFINED) AND EXISTS(SELF\IfcObjective.UserDefinedQualifier)); END_ENTITY;