IfcPropertyEnumeratedValue

Definition from IAI: A property with an enumerated value (IfcPropertyEnumeratedValue) defines a property object which has a value assigned which is chosen from an enumeration. It defines a property - value combination for which the property name, the value with measure type (and optional the unit) are given.

NOTE: Multiple choices from the property enumeration are supported.

The unit is handled by the Unit attribute of the IfcPropertyEnumeration:

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, thrn the unit assigned by the unit attribute overrides the globally assigned unit.

More precisely: The IfcPropertyEnumeratedValue defines a property, which value is selected from a defined list of enumerators. The enumerators are stored in a dynamic enumeration of values including the type information from IfcValue (see IfcPropertyEnumeration). This enables applications to use an enumeration value as a property within a property set (IfcPropertySet) including the allowed list of values. Examples of a property with enumerated value with are:

Name	Value (EnumerationValue)	Type (through IfcValue)	ref. IfcPropertyEnumeration (Name)
BladeAction	Opposed	IfcString	DamperBladeActionEnum
BladeAction	Parallel	IfcString	DamperBladeActionEnum

The IfcPropertyEnumeratedValue refers to an IfcPropertyEnumeration, e.g. for the above:

Name	EnumerationValues	Type (through IfcValue)	Unit
DamperBladeActionEnum	(Parallel, Opposed, Other, Unset)	IfcString	-

HISTORY: New Entity in IFC Release 2.0, capabilities enhanced in IFC R2x. The entity has been renamed from IfcEnumeratedProperty in IFC Release 2x.

EXPRESS specification:

ENTITY IfcPropertyEnumeratedValue

SUBTYPE OF (

IfcSimpleProperty);

EnumerationValues

LIST [1:?] OF IfcValue;

EnumerationReference

OPTIONAL IfcPropertyEnumeration;

WHERE

WR1

NOT(EXISTS(EnumerationReference)) OR (SIZEOF(QUERY(temp <* EnumerationValues | temp IN EnumerationReference.EnumerationValues)) = SIZEOF(EnumerationValues));

END_ENTITY;

Attribute definitions:

EnumerationValues	:	Enumeration values, which shall be listed in the referenced IfcPropertyEnumeration, if such a reference is provided.
EnumerationReference	:	Enumeration from which a enumeration value has been selected. The referenced enumeration also establishes the unit of the enumeration value.

Formal Propositions:

WR1

Each enumeration value shall be a member of the list of EnumerationValues at the referenced IfcPropertyEnumeration (if given).

Inheritance graph

ENTITY IfcPropertyEnumeratedValue;

ENTITY IfcProperty;

Name

IfcIdentifier;

Description

OPTIONAL IfcText;

INVERSE

PropertyForDependance

SET OF IfcPropertyDependencyRelationship FOR DependingProperty;

PropertyDependsOn

SET OF IfcPropertyDependencyRelationship FOR DependantProperty;

PartOfComplex