IfcResourceConstraintRelationship

BACnet MVD

#### IfcResourceConstraintRelationship

Natural language names

| allgemeine Relation - Zuweisung von Einschränkungen
| Resource Constraint Relationship

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcResourceConstraintRelationship |  |  | ADDED |

##### Semantic definitions at the entity

Entity definition

An IfcResourceConstraintRelationship is a relationship entity that enables a constraint to be related to one or more resource level objects.

An IfcResourceConstraintRelationship allows for the specification of a constraint to be applied to many entity types. An important case is to apply constraints to properties. The constraints applied therefore enable a property to carry values identifying requirements as well as those identifying the fulfilment of those requirements.

> HISTORY New entity in IFC2x2.

> IFC4 CHANGE Renamed from IfcPropertyConstraintRelationship and extended to apply to all resource level entities. Subtyped from IfcResourceLevelRelationship.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
3 | RelatingConstraint | IfcConstraint |  | The constraint that is to be related. |  | X
4 | RelatedResourceObjects | IfcResourceObjectSelect | S[1:?] | The properties to which a constraint is to be related. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcResourceLevelRelationship
1 | Name | IfcLabel | ? | A name used to identify or qualify the relationship. |  | X
2 | Description | IfcText | ? | A description that may apply additional information about the relationship. |  | X
IfcResourceConstraintRelationship
3 | RelatingConstraint | IfcConstraint |  | The constraint that is to be related. |  | X
4 | RelatedResourceObjects | IfcResourceObjectSelect | S[1:?] | The properties to which a constraint is to be related. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcResourceConstraintRelationship" type="ifc:IfcResourceConstraintRelationship" substitutionGroup="ifc:IfcResourceLevelRelationship" nillable="true"/>
<xs:complexType name="IfcResourceConstraintRelationship">
<xs:complexContent>
<xs:extension base="ifc:IfcResourceLevelRelationship">
<xs:sequence>
<xs:element name="RelatingConstraint" type="ifc:IfcConstraint" nillable="true"/>
<xs:element name="RelatedResourceObjects">
<xs:complexType>
<xs:group ref="ifc:IfcResourceObjectSelect" maxOccurs="unbounded"/>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcResourceObjectSelect"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcResourceConstraintRelationship
SUBTYPE OF (IfcResourceLevelRelationship);
RelatingConstraint : IfcConstraint;
RelatedResourceObjects : SET [1:?] OF IfcResourceObjectSelect;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcConstraint IfcProperty

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