#### 8.11.3.5 IfcPropertyEnumeration

| Propriété à valeurs énumérées
| Merkmal - Aufzählung

IfcPropertyEnumeration is a collection of simple or measure values that define a prescribed set of alternatives from which 'enumeration values' are selected. This enables inclusion of enumeration values in property sets. IfcPropertyEnumeration provides a name for the enumeration as well as a list of unique (numeric or descriptive) values (that may have a measure type assigned). The entity defines the list of potential enumerators to be exchanged together (or separately) with properties of type IfcPropertyEnumeratedValue that selects their actual property values from this enumeration.

The unit is handled by the Unit attribute, see Table 116 for an example of a unitless property enumeration:

- If the Unit attribute is not given, than 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, the unit assigned by the unit attribute overrides the globally assigned unit.

Name | EnumerationValues | Type (through IfcValue) | Unit
--- | --- | --- | ---
PEnum_DamperBladeAction | Parallel | IfcLabel | -
| Opposed | IfcLabel |
| Other | IfcLabel |
| Unset | IfcLabel |
Table 116 — Property enumeration with values, measure types and units

> HISTORY New entity in IFC2.0, capabilities enhanced in IFC2x.

> IFC2x CHANGE Entity has been renamed from IfcEnumeration

XSD Specification:

<xs:element name="IfcPropertyEnumeration" type="ifc:IfcPropertyEnumeration" substitutionGroup="ifc:IfcPropertyAbstraction" nillable="true"/>
<xs:complexType name="IfcPropertyEnumeration">
<xs:complexContent>
<xs:extension base="ifc:IfcPropertyAbstraction">
<xs:sequence>
<xs:element name="EnumerationValues">
<xs:complexType>
<xs:group ref="ifc:IfcValue" maxOccurs="unbounded"/>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcValue"/>
<xs:attribute ref="ifc:cType" fixed="list-unique"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Name" type="ifc:IfcLabel" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcPropertyEnumeration

| SUBTYPE OF IfcPropertyAbstraction;

Name | : | IfcLabel;
EnumerationValues | : | LIST [1:?] OF UNIQUE IfcValue;
Unit | : | OPTIONAL IfcUnit;

| UNIQUE

UR1 | : | Name;

| WHERE

WR01 | : | SIZEOF(QUERY(temp <* SELF.EnumerationValues | NOT(TYPEOF(SELF.EnumerationValues[1]) = TYPEOF(temp)) )) = 0;

END_ENTITY;

EXPRESS-G diagram

Attribute Definitions:

Name | : | Name of this enumeration.
EnumerationValues | : | List of values that form the enumeration.
Unit | : | Unit for the enumerator 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.

Formal Propositions:

WR01 | : | All values within the list of EnumerationValues shall be of the same measure type.

Inheritance Graph:

ENTITY IfcPropertyEnumeration

| ENTITY IfcPropertyAbstraction

| INVERSE

| ENTITY IfcPropertyEnumeration

Name | : | IfcLabel;
EnumerationValues | : | LIST [1:?] OF UNIQUE IfcValue;
Unit | : | OPTIONAL IfcUnit;

END_ENTITY;

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