gml:directedEdge

A gml:directedEdge property element describes the boundary of topology faces, the coBoundary of topology nodes and is used in the support of topological line features via the gml:TopoCurve expression, see below. The orientation attribute of type gml:SignType expresses the sense in which the included edge is used, i.e. forward or reverse.

Element information

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

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

Type: gml:DirectedEdgePropertyType

Properties: Global, Qualified

Content

gml:Edge [0..1]gml:Edge represents the 1-dimensional primitive. The topological boundary of an Edge (gml:directedNode) consists of a negatively directed start Node and a positively directed end Node. The optional coboundary of an edge (gml:directedFace) is a circular sequence of directed faces which are incident on this edge in document order. In the 2D case, the orientation of the face on the left of the edge is "+"; the orientation of the face on the right on its right is "-". If provided, the aggregationType attribute shall have the value "sequence". An edge may optionally be realised by a 1-dimensional geometric primitive (gml:curveProperty).

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:FaceType (Element gml:Face)
Type gml:NodeType (Element gml:Node)
Type gml:TopoCurveType (Element gml:TopoCurve)

Sample instance

<gml:directedEdge>
   <gml:Edge 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:container>
         <gml:TopoSolid gml:id="ID">...
         </gml:TopoSolid>
      </gml:container>
      <gml:directedNode>
         <gml:Node gml:id="ID">...
         </gml:Node>
      </gml:directedNode>
      <gml:directedFace>
         <gml:Face gml:id="ID">...
         </gml:Face>
      </gml:directedFace>
      <gml:curveProperty>
         <gml:LineString gml:id="ID">...
         </gml:LineString>
      </gml:curveProperty>
   </gml:Edge>
</gml:directedEdge>