#### 5.2.3.12 IfcZone

| Zone
| Zone

A zone is a group of spaces, partial spaces or other zones. Zone structures may not be hierarchical (in contrary to the spatial structure of a project - see IfcSpatialStructureElement), i.e. one individual IfcSpace may be associated with zero, one, or several IfcZone's. IfcSpace's are grouped into an IfcZone by using the objectified relationship IfcRelAssignsToGroup as specified at the supertype IfcGroup.

> NOTE Certain use cases may restrict the freedom of non hierarchical relationships. In some building service use cases the zone denotes a view based delimited volume for the purpose of analysis and calculation. This type of zone cannot overlap with respect to that analysis, but may overlap otherwise.

> HISTORY New entity in IFC1.0

> IFC4 CHANGE The entity is now subtyped from IfcSystem (not its supertype IfcGroup) with upward compatibility for file based exchange.

## Mechanical System Design

Instance diagram

Classification

The Classification concept applies to this entity.

Exchange |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Import | R |  | R |  |  | R
Export | R |  | R |  |  | R

Identity

The Identity concept applies to this entity.

Exchange |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Import | R |  | R |  |  | R
Export | R |  | R |  |  | R

XSD Specification:

<xs:element name="IfcZone" type="ifc:IfcZone" substitutionGroup="ifc:IfcSystem" nillable="true"/>
<xs:complexType name="IfcZone">
<xs:complexContent>
<xs:extension base="ifc:IfcSystem"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcZone

| SUBTYPE OF (IfcSystem);

LongName | : | OPTIONAL IfcStrippedOptional;

| WHERE

WR1 | : | (SIZEOF(SELF\IfcGroup.IsGroupedBy) = 0) OR (SIZEOF (QUERY (temp <* SELF\IfcGroup.IsGroupedBy[1].RelatedObjects | NOT(('IFCPRODUCTEXTENSION.IFCZONE' IN TYPEOF(temp)) OR ('IFCPRODUCTEXTENSION.IFCSPACE' IN TYPEOF(temp)) OR ('IFCPRODUCTEXTENSION.IFCSPATIALZONE' IN TYPEOF(temp)) ))) = 0);

END_ENTITY;

Attribute Definitions:

LongName | : | Long name for a zone, used for informal purposes. It should be used, if available, in conjunction with the inherited Name attribute. NOTE In many scenarios the Name attribute refers to the short name or number of a zone, and the LongName refers to the full name. IFC4 CHANGE The attribute has been added at the end of the entity definition.

Formal Propositions:

WR1 | : | An IfcZone is grouped by the objectified relationship IfcRelAssignsToGroup. Only objects of type IfcSpace, IfcZone and IfcSpatialZone are allowed as RelatedObjects.

Inheritance Graph:

ENTITY IfcZone

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
HasContext | : | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy | : | SET OF IfcRelAggregates FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;

| ENTITY IfcObject

ObjectType | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsTypedBy | : | SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;

| ENTITY IfcGroup

| INVERSE

IsGroupedBy | : | SET OF IfcRelAssignsToGroup FOR RelatingGroup;

| ENTITY IfcSystem

| INVERSE

| ENTITY IfcZone

LongName | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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