Natural language names
Opening Element Type Enum
Enumération des types d'ouverture
Change log
Semantic definitions at the type
Type definition

This enumeration defines the basic types for opening elements.

HISTORY  New enumeration type in IFC4.
Enumeration definition
OPENINGAn opening as subtraction feature that cuts through the element it voids. It thereby creates a hole. An opening in addiion have a particular meaning for either providing a void for doors or windows, or an opening to permit flow of air and passing of light.
RECESSAn opening as subtraction feature that does not cut through the element it voids. It creates a niche or similar voiding pattern.
USERDEFINEDUser-defined opening element.
NOTDEFINEDUndefined opening element.
Formal representations
XML Specification
 <xs:simpleType name="IfcOpeningElementTypeEnum">
  <xs:restriction base="xs:string">
   <xs:enumeration value="opening"/>
   <xs:enumeration value="recess"/>
   <xs:enumeration value="userdefined"/>
   <xs:enumeration value="notdefined"/>
EXPRESS Specification
TYPE IfcOpeningElementTypeEnum = ENUMERATION OF (

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcOpeningElement

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