#### 5.4.3.17 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.

## Construction Operations

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 assigned to 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.

Instance diagram

Identity

The Identity concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O
Export | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O

Revision Control

The Revision Control concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O
Export | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O

External Data Constraints

The External Data Constraints concept applies to this entity as shown in Table 37.

Table | Name | Reference | Format | Color
--- | --- | --- | --- | ---
Zone | Name | IfcZone.Name | Key | #FFFF99
Zone | CreatedBy | IfcZone.OwnerHistory\IfcOwnerHistory.OwningUser\IfcPersonAndOrganization.ThePerson\IfcPerson.Identification |  | #FFCC99
Zone | CreatedOn | IfcZone.OwnerHistory\IfcOwnerHistory.CreationDate |  | #FFFF99
Zone | Category | IfcZone.HasAssociations[*]\IfcRelAssociatesClassification.RelatingClassification\IfcClassificationReference.Identification | Key | #FFCC99
Zone | SpaceNames | IfcZone.IsGroupedBy[*]\IfcRelAssignsToGroup.RelatedObjects[*] | Key | #FFCC99
Zone | ExtSystem | IfcZone.OwnerHistory\IfcOwnerHistory.OwningApplication\IfcApplication.ApplicationIdentifier |  | #CC99FF
Zone | ExtObject | IfcZone\ |  | #CC99FF
Zone | ExtIdentifier | IfcZone.GlobalId |  | #CC99FF
Zone | Description | IfcZone.Description |  | #CCFFCC
System | Name | IfcSystem.Name | Key | #FFFF99
System | CreatedBy | IfcSystem.OwnerHistory\IfcOwnerHistory.OwningUser\IfcPersonAndOrganization.ThePerson\IfcPerson.Identification |  | #FFCC99
System | CreatedOn | IfcSystem.OwnerHistory\IfcOwnerHistory.CreationDate |  | #FFFF99
System | Category | IfcSystem.HasAssociations[*]\IfcRelAssociatesClassification.RelatingClassification\IfcClassificationReference.Identification | Key | #FFCC99
System | ComponentNames | IfcSystem.IsGroupedBy[*]\IfcRelAssignsToGroup.RelatedObjects[*] | Key | #FFCC99
System | ExtSystem | IfcSystem.OwnerHistory\IfcOwnerHistory.OwningApplication\IfcApplication.ApplicationIdentifier |  | #CC99FF
System | ExtObject | IfcSystem\ |  | #CC99FF
System | ExtIdentifier | IfcSystem.GlobalId |  | #CC99FF
System | Description | IfcSystem.Description |  | #CCFFCC
Table 37 — IfcZone External Data Constraints

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O
Export | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O

Classification

The Classification concept applies to this entity as shown in Table 38.

Source | Name | Tokens | Description
--- | --- | --- | ---
Construction Specifications Institute | OmniClass Table 14 | 14-00 00 00 | Spaces by Form
Construction Specifications Institute | OmniClass Table 21 | 21-00 00 00 | Elements
Table 38 — IfcZone Classification

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O
Export | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O

Group Assignment

The Group Assignment concept applies to this entity as shown in Table 39.

Type | Description
--- | ---
IfcSpace | Zones may contain zero or more spaces.
IfcElement | Systems may contain physical elements.
Table 39 — IfcZone Group Assignment

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O
Export | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O | O

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;
IsDefinedBy | : | SET OF IfcRelDefinesByProperties 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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