IfcObjective

BACnet MVD

#### IfcObjective

Natural language names

| Ziel (der Einschränkung)
| Objective
| Objectif

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcObjective |  |  |  |
CreationTime | X | X | MODIFIED | Type changed from IfcDateTimeSelect to IfcDateTime.
BenchmarkValues | X | X | MODIFIED | Type changed from IfcMetric to IfcConstraint. Aggregation changed from NONE to LIST.
LogicalAggregator | X | X | MODIFIED | Name changed from ResultValues to LogicalAggregator. Type changed from IfcMetric to IfcLogicalOperatorEnum.
IFC4 Addendum 1
IfcObjective |  |  |  |
PropertiesForConstraint |  |  | ADDED |
ConstrainedResources |  |  | DELETED |
ConstrainedObjects |  |  | DELETED |

##### 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

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---

8

BenchmarkValues

IfcConstraint

? L[1:?]

A list of nested constraints.

> IFC2X4 CHANGE Modified to be a LIST of nested constraints, which replaces the former IfcConstraintAggregationRelationship.

X

9

LogicalAggregator

IfcLogicalOperatorEnum

?

Enumeration that identifies the logical type of aggregation for the benchmark metrics.

> IFC2X4 CHANGE This attribute replaces replaces the former ResultValues attribute and indicates the aggregation behavior formerly defined at IfcConstraintAggregationRelationship.

X

10 | ObjectiveQualifier | IfcObjectiveEnum |  | Enumeration that qualifies the type of objective constraint. |  | X
11 | UserDefinedQualifier | IfcLabel | ? | A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type IfcObjectiveEnum has value USERDEFINED. |  | X

Formal Propositions

Rule | Description
--- | ---
WR21 | The attribute UserDefinedQualifier must be asserted when the value of the ObjectiveQualifier is set to USERDEFINED.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcConstraint
1 | Name | IfcLabel |  | A human-readable name to be used for the constraint. |  | X
2 | Description | IfcText | ? | A human-readable description that may apply additional information about a constraint. |  | X
3 | ConstraintGrade | IfcConstraintEnum |  | Enumeration that qualifies the type of constraint. |  | X
4 | ConstraintSource | IfcLabel | ? | Any source material, such as a code or standard, from which the constraint originated. |  | X
5 | CreatingActor | IfcActorSelect | ? | Person and/or organization that has created the constraint. |  | X
6 | CreationTime | IfcDateTime | ? | Time when information specifying the constraint instance was created. |  | X
7 | UserDefinedGrade | IfcLabel | ? | 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

HasExternalReferences

IfcExternalReferenceRelationship
@RelatedResourceObjects

S[0:?]

Reference to an external references, e.g. library, classification, or document information, that are associated to the constraint.

> IFC4 CHANGE New inverse attribute.

X

| PropertiesForConstraint | IfcResourceConstraintRelationship @RelatingConstraint | S[0:?] | Reference to the properties to which the constraint is applied. |  | X
IfcObjective

8

BenchmarkValues

IfcConstraint

? L[1:?]

A list of nested constraints.

> IFC2X4 CHANGE Modified to be a LIST of nested constraints, which replaces the former IfcConstraintAggregationRelationship.

X

9

LogicalAggregator

IfcLogicalOperatorEnum

?

Enumeration that identifies the logical type of aggregation for the benchmark metrics.

> IFC2X4 CHANGE This attribute replaces replaces the former ResultValues attribute and indicates the aggregation behavior formerly defined at IfcConstraintAggregationRelationship.

X

10 | ObjectiveQualifier | IfcObjectiveEnum |  | Enumeration that qualifies the type of objective constraint. |  | X
11 | UserDefinedQualifier | IfcLabel | ? | A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type IfcObjectiveEnum has value USERDEFINED. |  | X

##### Formal representations

XML 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;

EXPRESS-G diagram

`

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