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Annotations
Attributes
Diagrams
Instances
Properties
Source
Used by
Element gml:Face
Namespace http://www.opengis.net/gml/3.2
Annotations
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).
Diagram
Diagram index2.tmp#id78 index3.tmp#id72 index4.tmp#id93 index5.tmp#id95 index6.tmp#id99 index7.tmp#id104 index8.tmp#id71 index9.tmp#id70 index76.tmp#id803 index77.tmp#id805 index78.tmp#id391 index1083.tmp#id832 index1083.tmp#id812 index257.tmp#id814 index594.tmp#id829 index1084.tmp#id583 index1083.tmp#id811
Type gml:FaceType
Type hierarchy
Properties
content: complex
Used by
Model gml:metaDataProperty* , gml:description{0,1} , gml:descriptionReference{0,1} , gml:identifier{0,1} , gml:name* , gml:isolated* , gml:directedEdge+ , gml:directedTopoSolid{0,2} , gml:surfaceProperty{0,1}
Children gml:description, gml:descriptionReference, gml:directedEdge, gml:directedTopoSolid, gml:identifier, gml:isolated, gml:metaDataProperty, gml:name, gml:surfaceProperty
Instance
<gml:Face aggregationType="" gml:id="" universal="false">
  <gml:metaDataProperty about="" xlink:actuate="" xlink:arcrole="" xlink:href="" nilReason="" gml:remoteSchema="" xlink:role="" xlink:show="" xlink:title="" xlink:type="simple">{0,unbounded}</gml:metaDataProperty>
  <gml:description xlink:actuate="" xlink:arcrole="" xlink:href="" nilReason="" gml:remoteSchema="" xlink:role="" xlink:show="" xlink:title="" xlink:type="simple">{0,1}</gml:description>
  <gml:descriptionReference xlink:actuate="" xlink:arcrole="" xlink:href="" nilReason="" owns="false" gml:remoteSchema="" xlink:role="" xlink:show="" xlink:title="" xlink:type="simple">{0,1}</gml:descriptionReference>
  <gml:identifier codeSpace="">{0,1}</gml:identifier>
  <gml:name codeSpace="">{0,unbounded}</gml:name>
</gml:Face>
Attributes
QName Type Fixed Default Use Annotation
aggregationType gml:AggregationType optional
gml:id ID required
The 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.
universal boolean false optional
If the topological representation exists an unbounded manifold (e.g. Euclidean plane), a gml:Face must indicate whether it is a universal face or not, to ensure a lossless topology representation as defined by Kuijpers, et. al. (see OGC 05-102 Topology IPR). The optional universal attribute of type boolean is used to indicate this. NOTE The universal face is normally not part of any feature, and is used to represent the unbounded portion of the data set. Its interior boundary (it has no exterior boundary) would normally be considered the exterior boundary of the map represented by the data set.
Source
<element name="Face" type="gml:FaceType" substitutionGroup="gml:AbstractTopoPrimitive">
  <annotation>
    <documentation>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).</documentation>
  </annotation>
</element>
Schema location http://schemas.opengis.net/gml/3.2.1/topology.xsd