Definition from buildingSMART: A property with a single value
(IfcPropertySingleValue) defines a property object which has a single
(numeric or descriptive) value assigned. It defines a property - single value
combination for which the property name, the value with measure type (and
optionally the unit) is given.
The unit 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.
Examples of a property with single value are:
||Manufacturer "A" door
HISTORY: New entity in IFC Release
1.0. The entity has been renamed from IfcSimpleProperty in IFC Release
Value and measure type of this property.
NOTE By virtue of the defined data type, that is selected from the SELECT IfcValue, the appropriate unit can be found within the IfcUnitAssignment, defined for the project if no value for the unit attribute is given.
IFC2x Edition 3 CHANGE The attribute has been made optional with upward compatibility for file based exchange.
|| Unit for the nominal value, 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.