#### 8.2.2.2 IfcConstraintEnum

IfcConstraintEnum is an enumeration used to qualify a constraint.

> HISTORY New enumeration in IFC2.0

Enumerated Item Definitions:

- HARD: Qualifies a constraint such that it must be followed rigidly within or at the values set.
- SOFT: Qualifies a constraint such that it should be followed within or at the values set.
- ADVISORY: Qualifies a constraint such that it is advised that it is followed within or at the values set.
- USERDEFINED: A user-defined grade indicated by a separate attribute at the referencing entity.
- NOTDEFINED: Grade has not been specified.

XSD Specification:

<xs:simpleType name="IfcConstraintEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="hard"/>
<xs:enumeration value="soft"/>
<xs:enumeration value="advisory"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcConstraintEnum = ENUMERATION OF (
| HARD, SOFT, ADVISORY, USERDEFINED, NOTDEFINED);
END_TYPE;

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