Defined in File Ifc2x3.h
IfcPropertyListValue: public Ifc2x3::IfcSimpleProperty¶
An IfcPropertyListValue defines a property that has several (numeric or descriptive) values assigned, these values are given by an ordered list.It defines a property - list value combination for which the property Name, an optional Description,the optional ListValues with measure type and optionally an Unit is given.
An IfcPropertyListValue is a list of values. The order in which values appear is significant. Each value in the list is unique i.e. no duplicate values are allowed. All list members shall be of the same type.
The unit applicable to all values is handled by the Unit attribute:
If the Unit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext).
If the Unit attribute is given, then the unit assigned by the Unit attribute overrides the globally assigned unit.
Example of a property with list value is:
Type (through IfcValue)
HISTORY New Entity in Release IFC 2x Edition 2.
IFC2x4 CHANGE Attribute ListValues has been made OPTIONAL with upward compatibility for file based exchange.
List of property values.
IFC2x4 CHANGE The attribute has been made optional with upward compatibility for file based exchange.
Unit for the list values, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject.