IfcZone

#	Attribute	Type	Cardinality	Description	C
6	LongName	IfcLabel	[0:1]	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.	X

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

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[0:1]	Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object, NOTE only the last modification in stored - either as addition, deletion or modification.	X
3	Name	IfcLabel	[0:1]	Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.	X
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @RelatedObjects	S[0:?]	Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.	X
	Nests	IfcRelNests @RelatedObjects	S[0:1]	References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).	X
	IsNestedBy	IfcRelNests @RelatingObject	S[0:?]	References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).	X
	HasContext	IfcRelDeclares @RelatedDefinitions	S[0:1]	References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.	X
	IsDecomposedBy	IfcRelAggregates @RelatingObject	S[0:?]	References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).	X
	Decomposes	IfcRelAggregates @RelatedObjects	S[0:1]	References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).	X
	HasAssociations	IfcRelAssociates @RelatedObjects	S[0:?]	Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.	X
IfcObject
5	ObjectType	IfcLabel	[0:1]	The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.	X
	IsDeclaredBy	IfcRelDefinesByObject @RelatedObjects	S[0:1]	Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.	X
	Declares	IfcRelDefinesByObject @RelatingObject	S[0:?]	Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.	X
	IsTypedBy	IfcRelDefinesByType @RelatedObjects	S[0:1]	Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.	X
	IsDefinedBy	IfcRelDefinesByProperties @RelatedObjects	S[0:?]	Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.	X
IfcGroup
	IsGroupedBy	IfcRelAssignsToGroup @RelatingGroup	S[0:?]	Reference to the relationship IfcRelAssignsToGroup that assigns the one to many group members to the IfcGroup object.	X
IfcSystem
	ServicesBuildings	IfcRelServicesBuildings @RelatingSystem	S[0:1]	Reference to the ~~building~~ spatial structure via the objectified relationship IfcRelServicesBuildings, which is serviced by the system.	X
IfcZone
6	LongName	IfcLabel	[0:1]	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.	X

Definitions applying to Common Use Definitions

Instance diagram

Concept usage

Classification Association

The Classification Association concept applies to this entity.

Additional classifications of the IfcZone, as provided by a national classification system, can be assigned by using the IfcRelAssociatesClassification relationship, accessible via the inverse attribute HasAssociations. The IfcZone can be assigned to a spatial structure element, it refers to, e.g. to a particular IfcBuildingStorey by using the IfcRelServicesBuildings relationship, accessible via the inverse attribute ServicesBuilding.

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 78.

PredefinedType

Name

Properties

Pset_ZoneCommon

Single Value

Name	Value
Reference	IfcIdentifier
IsExternal	IfcBoolean
GrossPlannedArea	IfcAreaMeasure
NetPlannedArea	IfcAreaMeasure
PubliclyAccessible	IfcBoolean
HandicapAccessible	IfcBoolean

Pset_AirSideSystemInformation

Single Value

Name	Value
Name	IfcLabel
Description	IfcLabel
TotalAirflow	IfcVolumetricFlowRateMeasure
EnergyGainTotal	IfcPowerMeasure
AirflowSensible	IfcVolumetricFlowRateMeasure
EnergyGainSensible	IfcPowerMeasure
EnergyLoss	IfcPowerMeasure
LightingDiversity	IfcPositiveRatioMeasure
InfiltrationDiversitySummer	IfcPositiveRatioMeasure
InfiltrationDiversityWinter	IfcPositiveRatioMeasure
ApplianceDiversity	IfcPositiveRatioMeasure
LoadSafetyFactor	IfcPositiveRatioMeasure
HeatingTemperatureDelta	IfcThermodynamicTemperatureMeasure
CoolingTemperatureDelta	IfcThermodynamicTemperatureMeasure
Ventilation	IfcVolumetricFlowRateMeasure
FanPower	IfcPowerMeasure

Enumerated Value

Name	Value	Value
AirSideSystemType	IfcLabel	IfcLabel
AirSideSystemDistributionType	IfcLabel	IfcLabel

Pset_ServiceLifeFactors

Bounded Value

Name	Value	Value
QualityOfComponents	IfcPositiveRatioMeasure	IfcPositiveRatioMeasure
DesignLevel	IfcPositiveRatioMeasure	IfcPositiveRatioMeasure
WorkExecutionLevel	IfcPositiveRatioMeasure	IfcPositiveRatioMeasure
IndoorEnvironment	IfcPositiveRatioMeasure	IfcPositiveRatioMeasure
OutdoorEnvironment	IfcPositiveRatioMeasure	IfcPositiveRatioMeasure
InUseConditions	IfcPositiveRatioMeasure	IfcPositiveRatioMeasure
MaintenanceLevel	IfcPositiveRatioMeasure	IfcPositiveRatioMeasure

Table 78 — IfcZone Property Sets for Objects

Group Assignment

The Group Assignment concept applies to this entity as shown in Table 79.

RelatedType

Table 79 — IfcZone Group Assignment

An IfcZone is a spatial system under which individual IfcSpace's (and other IfcZone's) are grouped. In contrary to the IfcSpatialZone entity, IfcZone is a mere grouping, it can not define an own geometric representation and placement. Therefore it cannot be used for spatial zones having a different shape and size compared to the shape and size of aggregated spaces.

NOTE The IfcZone is regarded as the spatial system (as compared to the building service, electrical, or analytical system), the name remains IfcZone for compatibility reasons, instead of using a proper naming convention, like IfcSpatialSystem.

NOTE One of the purposes of a zone is to define a fire compartmentation. In this case it defines the geometric information about the fire compartment (through the contained spaces) and information, whether this compartment is ventilated or sprinkler protected. In addition the fire risk code and the hazard type can be added, the coding is normally defined within a national fire regulation. All that information is available within the relevant property sets. Again, if an independent shape has to be provided to the fire compartment, then the entity IfcSpatialZone shall be used.

In case of a zone denoting a (fire) compartment, the following types should be used, if applicable, as values of the ObjectType attribute:

'FireCompartment': a zone of spaces, collected to represent a single fire compartment.
'ElevatorShaft': a collection of spaces within an elevator, potentially going through many storeys.
'RisingDuct': A collection of vertical airspaces.
'RunningDuct': A collection of horizontal airspaces.

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Common Use Definitions
	Revision Control	Common Use Definitions
IfcObject
	Object Occurrence Predefined Type	Common Use Definitions
IfcGroup
IfcSystem
IfcZone
	Classification Association	Common Use Definitions
	Property Sets for Objects	Common Use Definitions
	Group Assignment	Common Use Definitions

Formal representations

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:attribute name="LongName" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcZone

 SUBTYPE OF (IfcSystem);

  LongName : OPTIONAL IfcLabel;

 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;

 EXPRESS-G diagram

Link to this page

Item	Change	Description
IFC2x3 to IFC4
IfcZone
OwnerHistory	MODIFIED	Instantiation changed to OPTIONAL.
LongName	ADDED

	Zone
	Zone
	Zone

IfcZone

Semantic definitions at the entity

Inherited definitions from supertypes

Definitions applying to Common Use Definitions

Formal representations