IfcObjective

Natural language names
deZiel (der Einschränkung)
enObjective
frObjectif: Capture l'information quantitative associée à une contrainte de type objectif.
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcObjective
      CreationTimeXXMODIFIEDType changed from IfcDateTimeSelect to IfcDateTime.
      BenchmarkValuesXXMODIFIEDType changed from IfcMetric to IfcConstraint.
Aggregation changed from NONE to LIST.
      LogicalAggregatorXXMODIFIEDName changed from ResultValues to LogicalAggregator.
Type changed from IfcMetric to IfcLogicalOperatorEnum.
IFC4 Addendum 1
    IfcObjective
      PropertiesForConstraintADDED
      ConstrainedResourcesDELETED
      ConstrainedObjectsDELETED
Semantic definitions at the entity
Entity 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.

HISTORY  New entity in IFC2.0.
IFC4 CHANGE  Attribute BenchmarkValues modified to be a LIST of IfcConstraint, attribute ResultValues replaced with IfcLogicalOperatorEnum.
Attribute definitions
#AttributeTypeCardinalityDescription C
8BenchmarkValuesIfcConstraintL[1:?] A list of nested constraints. X
9LogicalAggregatorIfcLogicalOperatorEnum[0:1] Enumeration that identifies the logical type of aggregation for the benchmark metrics. X
10ObjectiveQualifierIfcObjectiveEnum[1:1] Enumeration that qualifies the type of objective constraint. X
11UserDefinedQualifierIfcLabel[0:1] A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type IfcObjectiveEnum has value USERDEFINED.X
Formal Propositions
RuleDescription
WR21The attribute UserDefinedQualifier must be asserted when the value of the ObjectiveQualifier is set to USERDEFINED.
Inherited definitions from supertypes
Entity inheritance IfcConstraint
Attribute inheritance
#AttributeTypeCardinalityDescriptionC
IfcConstraint
1NameIfcLabel[1:1] A human-readable name to be used for the constraint.X
2DescriptionIfcText[0:1] A human-readable description that may apply additional information about a constraint.X
3ConstraintGradeIfcConstraintEnum[1:1] Enumeration that qualifies the type of constraint.X
4ConstraintSourceIfcLabel[0:1] Any source material, such as a code or standard, from which the constraint originated. X
5CreatingActorIfcActorSelect[0:1] Person and/or organization that has created the constraint.X
6CreationTimeIfcDateTime[0:1] Time when information specifying the constraint instance was created.X
7UserDefinedGradeIfcLabel[0:1] 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.X
HasExternalReferencesIfcExternalReferenceRelationship
@RelatedResourceObjects
S[0:?]Reference to an external references, e.g. library, classification, or document information, that are associated to the constraint. X
PropertiesForConstraintIfcResourceConstraintRelationship
@RelatingConstraint
S[0:?]Reference to the properties to which the constraint is applied.X
IfcObjective
8BenchmarkValuesIfcConstraintL[1:?] A list of nested constraints. X
9LogicalAggregatorIfcLogicalOperatorEnum[0:1] Enumeration that identifies the logical type of aggregation for the benchmark metrics. X
10ObjectiveQualifierIfcObjectiveEnum[1:1] Enumeration that qualifies the type of objective constraint. X
11UserDefinedQualifierIfcLabel[0:1] A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type IfcObjectiveEnum has value USERDEFINED.X
Formal representations
XSD Specification
 <xs:element name="IfcObjective" type="ifc:IfcObjective" substitutionGroup="ifc:IfcConstraint" nillable="true"/>
 <xs:complexType name="IfcObjective">
  <xs:complexContent>
   <xs:extension base="ifc:IfcConstraint">
    <xs:sequence>
     <xs:element name="BenchmarkValues" nillable="true" minOccurs="0">
      <xs:complexType>
       <xs:sequence>
        <xs:element ref="ifc:IfcConstraint" maxOccurs="unbounded"/>
       </xs:sequence>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcConstraint"/>
       <xs:attribute ref="ifc:cType" fixed="list"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
      </xs:complexType>
     </xs:element>
    </xs:sequence>
    <xs:attribute name="LogicalAggregator" type="ifc:IfcLogicalOperatorEnum" use="optional"/>
    <xs:attribute name="ObjectiveQualifier" type="ifc:IfcObjectiveEnum" use="optional"/>
    <xs:attribute name="UserDefinedQualifier" type="ifc:IfcLabel" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
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;

Link to EXPRESS-G diagram EXPRESS-G diagram

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