IfcLayeredItem

BACnet MVD

#### IfcLayeredItem

Natural language names

| Geometrische Repräsentation bezogen auf Präsentations-Layer
| Layered Item
| Item composite

##### Semantic definitions at the type

Type definition

The IfcLayeredItem is the collection of all those items, that are assigned to a single layer. These items are representation items or complete representations (IfcRepresentationItem, IfcRepresentation). If an IfcRepresentation is referenced, all IfcRepresentationItem within its set of Items are assigned to the same layer.

> NOTE Definition according to ISO 10303-46:
> The layered things type selects those things, which can be grouped in layers.

> NOTE Corresponding ISO 10303 name: layered_item. It was called layered_things in the ISO/CD version and had been renamed to layered_item in the ISO/IS final version. Please refer to ISO/IS 10303-46:1994, p. 13 for the final definition of the formal standard.

> HISTORY New type in IFC2x2.

Select definition

Type | Description
--- | ---
IfcRepresentationItem |
IfcRepresentation |

##### Formal representations

XML Specification
`<xs:group name="IfcLayeredItem">
<xs:choice>
<xs:element ref="ifc:IfcRepresentation"/>
<xs:element ref="ifc:IfcRepresentationItem"/>
</xs:choice>
</xs:group>
`
EXPRESS Specification
`TYPE IfcLayeredItem = SELECT (
IfcRepresentationItem,
IfcRepresentation);
END_TYPE;

EXPRESS-G diagram

`

References: IfcPresentationLayerAssignment

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