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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 index18.tmp#id85 index19.tmp#id79 index20.tmp#id100 index21.tmp#id102 index22.tmp#id106 index23.tmp#id111 index24.tmp#id78 index25.tmp#id77 index347.tmp#id785 index348.tmp#id787 index26.tmp#id389 index931.tmp#id814 index931.tmp#id794 index766.tmp#id796 index932.tmp#id811 index933.tmp#id555 index931.tmp#id793
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