IfcResourceConstraintRelationship

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	C
3	RelatingConstraint	IfcConstraint	[1:1]	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	C
IfcResourceLevelRelationship
1	Name	IfcLabel	[0:1]	A name used to identify or qualify the relationship.	X
2	Description	IfcText	[0:1]	A description that may apply additional information about the relationship.	X
IfcResourceConstraintRelationship
3	RelatingConstraint	IfcConstraint	[1:1]	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

XSD 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

	allgemeine Relation - Zuweisung von Einschränkungen
	Resource Constraint Relationship