5.4.3.17 IfcZone
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.
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Revision Control
The Revision Control concept applies to this entity.
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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 |
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Table 37 — IfcZone External Data Constraints |
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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 |
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Table 38 — IfcZone Classification |
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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. |
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Table 39 — IfcZone Group Assignment |
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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:
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| LongName | : | OPTIONAL IfcStrippedOptional; |
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| 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); |
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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.
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Formal Propositions:
| WR1 | : |
An IfcZone is grouped by the objectified relationship IfcRelAssignsToGroup. Only objects of type IfcSpace, IfcZone and IfcSpatialZone are allowed as RelatedObjects.
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Inheritance Graph:
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| ObjectType | : | OPTIONAL IfcStrippedOptional; |
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| LongName | : | OPTIONAL IfcStrippedOptional; |
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