IfcObjective

IfcObjective

实体定义

IfcObjective捕获基于目标的约束的定性信息。

 

IfcObjective是IfcConstraint的一个子类型，可以通过IfcControlExtension架构中的IfcRelAssociatesConstraint关系与IfcRoot的任何子类型相关联，也可以通过IfcResourceConstraintRelationship与IfcProperty相关联。

 

IfcObjective的目的是指定应用约束的目的，并获取约束的基准度量。

 

IFC2.0中的新实体。

IFC4 属性BenchmarkValues修改为IfcConstraint的LIST，属性ResultValues替换为IfcLogicalOperatorEnum。

 

 

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
8	BenchmarkValues	IfcConstraint	L[1:?]	A list of nested constraints.	X
9	LogicalAggregator	IfcLogicalOperatorEnum	[0:1]	Enumeration that identifies the logical type of aggregation for the benchmark metrics.	X
10	ObjectiveQualifier	IfcObjectiveEnum	[1:1]	Enumeration that qualifies the type of objective constraint.	X
11	UserDefinedQualifier	IfcLabel	[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

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

 

 

 

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcConstraint
1	Name	IfcLabel	[1:1]	A human-readable name to be used for the constraint.	X
2	Description	IfcText	[0:1]	A human-readable description that may apply additional information about a constraint.	X
3	ConstraintGrade	IfcConstraintEnum	[1:1]	Enumeration that qualifies the type of constraint.	X
4	ConstraintSource	IfcLabel	[0:1]	Any source material, such as a code or standard, from which the constraint originated.	X
5	CreatingActor	IfcActorSelect	[0:1]	Person and/or organization that has created the constraint.	X
6	CreationTime	IfcDateTime	[0:1]	Time when information specifying the constraint instance was created.	X
7	UserDefinedGrade	IfcLabel	[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
	HasExternalReferences	IfcExternalReferenceRelationship @RelatedResourceObjects	S[0:?]	Reference to an external references, e.g. library, classification, or document information, that are associated to the constraint.	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.	X
9	LogicalAggregator	IfcLogicalOperatorEnum	[0:1]	Enumeration that identifies the logical type of aggregation for the benchmark metrics.	X
10	ObjectiveQualifier	IfcObjectiveEnum	[1:1]	Enumeration that qualifies the type of objective constraint.	X
11	UserDefinedQualifier	IfcLabel	[0:1]	A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type IfcObjectiveEnum has value USERDEFINED.	X

 

 

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;

 

 

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