|Type d'élément géographique|
|Geographisches Objekt - Typ|
An IfcGeographicElementType is used to define an
element specification of a geographic element (i.e. the
specific product information, that is common to all
occurrences of that product type). Geographic element types
include for different types of element that may be used to
represent information within a geographical landscape
external to a building. Within the world of geographic
information they are referred to generally as 'features'.
- linear elements such as sections of a roadway (including
carriageway/pavement, verge, median, marker line, kerb etc.),
or a path, river, stream;
- connections and junctions including traffic roundabouts,
T junctions, 4 way junctions;
- point features such as street lighting, seating, bus
shelters, signage, trees;
- linear features such as layby's;
- area features such as ponds, lakes, woods and forests;
- drainage such as catchment, reserver or outfall.
The specification of the specific types are given by the
inherited attribute IfcElementType.ElementType given
as an IfcLabel.
NOTE This is due to the range of choices of element type
thyat are available and their expression in different
languages. It is not considered possible to create a
reasonably full list of types within an enumeration. It is
suggested that selection of the relevant type be drawn from
an available 'feature catalog'.
HISTORY New entity in IFC4.
Feature Catalog Use Definition
Geographic element types are frequently identified in feature
catalogs that are produced for particular purposes. The
IfcGeographicElementType entity enables the continued
use of existing feature catalogs through capture of their
identity and attributes.
Information from feature catalogs might be captured in
- via property sets, some of which will be specifically
defined within the IFC property set catalog whilst others
will be created for local use; this is the form of capture
that is expected to be most widely used
- through use of the IFC classification model whereby
features might be identified through an
IfcClassificationReference with additional
description; in which case, any further attributes required
would still need to be captured in property sets.
XSD Specification: <xs:element name="IfcGeographicElementType" type="ifc:IfcGeographicElementType" substitutionGroup="ifc:IfcElementType" nillable="true"/>
<xs:attribute name="PredefinedType" type="ifc:IfcGeographicElementTypeEnum" use="optional"/>
|CorrectPredefinedType|| : ||(PredefinedType <> IfcGeographicElementTypeEnum.USERDEFINED) OR
((PredefinedType = IfcGeographicElementTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));|
|PredefinedType|| : ||
Predefined types to define the particular type of the geographic element. There may be property set definitions available for each predefined type.
|CorrectPredefinedType|| : ||
The inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.
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