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IfcIdentifier

Definition from ISO/CD 10303-41:1992: An identifier is an alphanumeric string which allows an individual thing to be identified. It may not provide natural-language meaning.

Type: STRING
HISTORY New type in IFC Release 2x.
ISSUE See issue and change log for changes made in IFC Release 2x.

EXPRESS specification:

TYPE IfcIdentifier = STRING;
END_TYPE;

References (1):

Name Type Referred through Express-G
IfcSimpleValue Select
Select relation
Diagram 2