gml:directedFace

The gml:directedFace property element describes the boundary of topology solids, in the coBoundary of topology edges and is used in the support of surface features via the gml:TopoSurface expression, see below. The orientation attribute of type gml:SignType expresses the sense in which the included face is used i.e. inward or outward with respect to the surface normal in any geometric realisation.

Element information

Namespace: http://www.opengis.net/gml/3.2

Schema document: external/ogc/gml/3.2.1/topology.xsd

Type: gml:DirectedFacePropertyType

Properties: Global, Qualified

Content

gml:Face [0..1]gml:Face represents the 2-dimensional topology primitive. The topological boundary of a face (gml:directedEdge) consists of a sequence of directed edges. If provided, the aggregationType attribute shall have the value "sequence". The optional coboundary of a face (gml:directedTopoSolid) is a pair of directed solids which are bounded by this face. A positively directed solid corresponds to a solid which lies in the direction of the negatively directed normal to the face in any geometric realisation. A face may optionally be realised by a 2-dimensional geometric primitive (gml:surfaceProperty).

Attributes

Name	Occ	Type	Notes
orientation	[0..1]	gml:SignType	Default value is "+".
nilReason	[0..1]	gml:NilReasonType	from group gml:AssociationAttributeGroup
gml:remoteSchema	[0..1]	xsd:anyURI	from group gml:AssociationAttributeGroup
owns	[0..1]	xsd:boolean	Default value is "false". from group gml:OwnershipAttributeGroup

Used in

Type gml:EdgeType (Element gml:Edge)
Type gml:TopoSolidType (Element gml:TopoSolid)
Type gml:TopoSurfaceType (Element gml:TopoSurface)

Sample instance

<gml:directedFace>
   <gml:Face gml:id="ID">
      <gml:metaDataProperty>
         <gml:GenericMetaData>Any text, intermingled with:
            <!--any element-->
         </gml:GenericMetaData>
      </gml:metaDataProperty>
      <gml:description>string</gml:description>
      <gml:descriptionReference/>
      <gml:identifier codeSpace="http://www.example.com/">string</gml:identifier>
      <gml:name>string</gml:name>
      <gml:isolated>
         <gml:Node gml:id="ID">...
         </gml:Node>
      </gml:isolated>
      <gml:directedEdge>
         <gml:Edge gml:id="ID">...
         </gml:Edge>
      </gml:directedEdge>
      <gml:directedTopoSolid>
         <gml:TopoSolid gml:id="ID">...
         </gml:TopoSolid>
      </gml:directedTopoSolid>
      <gml:surfaceProperty>
         <gml:Polygon gml:id="ID">...
         </gml:Polygon>
      </gml:surfaceProperty>
   </gml:Face>
</gml:directedFace>