IfcConstraintEnum

BACnet MVD

#### IfcConstraintEnum

Natural language names

| Constraint Enum
| Enumération des types de contrainte

##### Semantic definitions at the type

Type definition

IfcConstraintEnum is an enumeration used to qualify a constraint.

> HISTORY New enumeration in IFC2.0

Enumeration definition

Constant | Description
--- | ---
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.

##### Formal representations

XML 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;

EXPRESS-G diagram

`

References: IfcConstraint

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