IfcZone

BACnet MVD

#### IfcZone

Natural language names

| Zone
| Zone
| Zone

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcZone |  |  |  |
OwnerHistory |  |  | MODIFIED | Instantiation changed to OPTIONAL.
LongName |  |  | ADDED |

##### Semantic definitions at the entity

Entity definition

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.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---

6

LongName

IfcLabel

?

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.

X

Formal Propositions

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 | B
--- | --- | --- | --- | --- | ---
IfcRoot
1 | GlobalId | IfcGloballyUniqueId |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

IfcOwnerHistory

?

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.

> IFC4 CHANGE The attribute has been changed to be OPTIONAL.

X

X

3 | Name | IfcLabel | ? | 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 | X
4 | Description | IfcText | ? | 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).

> IFC4 CHANGE The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.

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).

> IFC4 CHANGE The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.

X

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.

> IFC4 CHANGE The inverse attribute datatype has been added.

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).

> IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.

X

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).

> IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.

X

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 | X
IfcObject

5

ObjectType

IfcLabel

?

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.

> IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.

X

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.

> IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.

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.

> IFC4 CHANGE New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange.

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.

> IFC4 CHANGE The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.

X

IfcGroup

IsGroupedBy

IfcRelAssignsToGroup
@RelatingGroup

S[0:?]

Reference to the relationship IfcRelAssignsToGroup that assigns the one to many group members to the IfcGroup object.

> IFC4 CHANGE The cardinality has been changed from 1..1 to 0..? in order to allow the exchange of a group concept without having already group members assigned. It now also allows the use of many instances of IfcRelAssignsToGroup to assign the group members. The change has been done with upward compatibility for file based exchange.

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

?

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.

X

##### Definitions applying to Design Transfer View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Definitions applying to BACnet View

Instance diagram

#####

Concept usage

Spatial Structure

The Spatial Structure concept applies to this entity.

BACnet ObjectDefinition Composition

The BACnet ObjectDefinition Composition concept applies to this entity.

Software Identity

The Software Identity concept applies to this entity.

Object User Identity

The Object User Identity concept applies to this entity.

Object Predefined Type

The Object Predefined Type concept applies to this entity.

Property Sets for Objects

The Property Sets for Objects concept template applies to this entity as shown in Table 9.

PsetName | Properties
--- | ---

Pset_BACnetLifeSafetyZoneObject

Template | PropertyName | Value | Reference
--- | --- | --- | ---
Enumerated Value | Present Value | IfcLabel | PEnum_BACnetLifeSafetyState
Enumerated Value | Tracking Value | IfcLabel | PEnum_BACnetLifeSafetyState
Enumerated Value | Status Flags | IfcLabel | PEnum_BACnetStatusFlag
Enumerated Value | Event State | IfcLabel | PEnum_BACnetEventState
Single Value | Out of Service | IfcBoolean |
Enumerated Value | Reliability | IfcLabel | PEnum_BACnetReliability
Enumerated Value | Accepted Modes | IfcLabel | PEnum_BACnetLifeSafetyMode
Enumerated Value | Silenced | IfcLabel | PEnum_BACnetSilencedState
Enumerated Value | Operation Expected | IfcLabel | PEnum_BACnetLifeSafetyOperation
Enumerated Value | Event State | IfcLabel | PEnum_BACnetEventState
Enumerated Value | Reliability | IfcLabel | PEnum_BACnetReliability
Enumerated Value | Accepted Modes | IfcLabel | PEnum_BACnetLifeSafetyMode
Enumerated Value | Silenced | IfcLabel | PEnum_BACnetSilencedState
Enumerated Value | Operation Expected | IfcLabel | PEnum_BACnetLifeSafetyOperation

Table 9 — IfcZone Property Sets for Objects

Object Nesting

The Object Nesting concept applies to this entity.

mvdXML Specification
`<?xml version="1.0"?>
<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="f106362c-fa98-4a7a-9292-989e804fe8f4" name="IfcZone" status="sample" applicableRootEntity="IfcZone">
<Concepts>
<Concept uuid="9044acef-b31b-45e4-8e9c-6f1b6d867866" name="Spatial Structure" status="sample" override="false">
<Template ref="81bc486c-1976-4e11-a469-cff2f70f123e" />
<Requirements>
<Requirement applicability="import" requirement="recommended" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
<Requirement applicability="export" requirement="recommended" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
</Requirements>
</Concept>
<Concept uuid="df4bd41c-37eb-437c-9ae3-79a9ea867005" name="BACnet ObjectDefinition Composition" status="sample" override="false">
<Template ref="c8ce5b1b-84be-4e74-971f-0f7a5e0a654b" />
<Requirements>
<Requirement applicability="import" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
<Requirement applicability="export" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
</Requirements>
</Concept>
<Concept uuid="72e16426-3f9a-4a21-92af-6e4f266f349e" name="Software Identity" status="sample" override="false">
<Template ref="f7cb0a08-fee7-4cc0-85fe-43f6a6a0bce1" />
<Requirements>
<Requirement applicability="import" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
<Requirement applicability="export" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
</Requirements>
</Concept>
<Concept uuid="27da9a9f-f9fd-4919-a575-8e2a4ad6de3a" name="Object User Identity" status="sample" override="false">
<Template ref="c19ec186-9cfd-47fc-a4d4-9fb35008d04a" />
<Requirements>
<Requirement applicability="import" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
<Requirement applicability="export" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
</Requirements>
</Concept>
<Concept uuid="ebd7f45e-cc23-44a0-a82d-b874fa977822" name="Object Predefined Type" status="sample" override="false">
<Template ref="25248261-98df-4d0a-9364-5653575ca421" />
<Requirements>
<Requirement applicability="import" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
<Requirement applicability="export" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
</Requirements>
</Concept>
<Concept uuid="577ed1cd-b831-47d9-8266-8a13a3ef6327" name="Property Sets for Objects" status="sample" override="false">
<Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
<Requirements>
<Requirement applicability="import" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
<Requirement applicability="export" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
</Requirements>
<TemplateRules operator="and">
<TemplateRule Parameters="PsetName[Value]='Pset_BACnetLifeSafetyZoneObject'" />
</TemplateRules>
</Concept>
<Concept uuid="c8a970db-a04e-41b0-b40b-c7165ac1269f" name="Object Nesting" status="sample" override="false">
<Template ref="38ca8788-5e47-411c-8294-d56f9e9a5691" />
<Requirements>
<Requirement applicability="import" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
<Requirement applicability="export" requirement="mandatory" exchangeRequirement="b8a611d3-6f94-4bdf-b974-b74089a6e6c7" />
</Requirements>
</Concept>
</Concepts>
</ConceptRoot>
`
Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View
IfcZone
| Spatial Structure | Spatial Structure | BACnet View
| BACnet ObjectDefinition Composition | BACnet ObjectDefinition Composition | BACnet View
| Software Identity | Software Identity | BACnet View
| Object User Identity | Object User Identity | BACnet View
| Object Predefined Type | Object Predefined Type | BACnet View
| Property Sets for Objects | Property Sets for Objects | BACnet View
| Object Nesting | Object Nesting | BACnet View

##### Formal representations

XML 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