Schema Central > NIEM 3.1 > topology.xsd > gml:Node
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gml:Node

gml:Node represents the 0-dimensional primitive.
The optional coboundary of a node (gml:directedEdge) is a sequence of directed edges which are incident on this node. Edges emanating from this node appear in the node coboundary with a negative orientation. 
If provided, the aggregationType attribute shall have the value "sequence".
A node may optionally be realised by a 0-dimensional geometric primitive (gml:pointProperty).

Element information

Type: gml:NodeType

Properties: Global, Qualified

Content

Attributes

NameOccTypeDescriptionNotes
gml:id [1..1]xsd:IDThe attribute gml:id supports provision of a handle for the XML element representing a GML Object. Its use is mandatory for all GML objects. It is of XML type ID, so is constrained to be unique in the XML document within which it occurs.from type gml:AbstractGMLType
aggregationType [0..1]gml:AggregationTypefrom group gml:AggregationAttributeGroup

Used in

Substitution hierarchy

Sample instance

<gml:Node 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:Face gml:id="ID">
         <gml:metaDataProperty>...
         </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:isolated>
         <gml:directedEdge>...
         </gml:directedEdge>
         <gml:directedTopoSolid>...
         </gml:directedTopoSolid>
         <gml:surfaceProperty>...
         </gml:surfaceProperty>
      </gml:Face>
   </gml:container>
   <gml:directedEdge>
      <gml:Edge gml:id="ID">
         <gml:metaDataProperty>...
         </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:container>
         <gml:directedNode>...
         </gml:directedNode>
         <gml:directedFace>...
         </gml:directedFace>
         <gml:curveProperty>...
         </gml:curveProperty>
      </gml:Edge>
   </gml:directedEdge>
   <gml:pointProperty>
      <gml:Point gml:id="ID">
         <gml:metaDataProperty>...
         </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:pos>1.0 1.0</gml:pos>
      </gml:Point>
   </gml:pointProperty>
</gml:Node>

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