IfcStructuralSurfaceActivityTypeEnum

BACnet MVD

#### IfcStructuralSurfaceActivityTypeEnum

Natural language names

| Structural Surface Activity Type Enum

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcStructuralSurfaceActivityTypeEnum |  |  | ADDED |

##### Semantic definitions at the type

Type definition

This enumeration defines the distribution of load values in a surface action or reaction.

> HISTORY New enumeration in IFC4

Enumeration definition

Constant | Description
--- | ---
CONST | The load has a constant value over its entire extent.
BILINEAR | The load value is bilinearly distributed over the load's extent.
DISCRETE | The load is specified as a series of discrete load points.
ISOCONTOUR | The load is specified by a series of iso-curves (level sets), i.e. curves at which the load value is constant. These curves run perpendicularly to the load gradient.
USERDEFINED | The load distribution is user-defined.
NOTDEFINED | The load distribution is undefined.

##### Formal representations

XML Specification
`<xs:simpleType name="IfcStructuralSurfaceActivityTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="const"/>
<xs:enumeration value="bilinear"/>
<xs:enumeration value="discrete"/>
<xs:enumeration value="isocontour"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>
`
EXPRESS Specification
`TYPE IfcStructuralSurfaceActivityTypeEnum = ENUMERATION OF (
CONST,
BILINEAR,
DISCRETE,
ISOCONTOUR,
USERDEFINED,
NOTDEFINED);
END_TYPE;

EXPRESS-G diagram

`

References: IfcStructuralSurfaceAction IfcStructuralSurfaceReaction

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