Schema Central > niem40 > temporalReferenceSystems.xsd > gml:TimeCoordinateSystem
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A temporal coordinate system shall be based on a continuous interval scale defined in terms of a single time interval.
The differences to ISO 19108 TM_CoordinateSystem are:
-	the origin is specified either using the property gml:originPosition whose value is a direct time position, or using the property gml:origin whose model is gml:TimeInstantPropertyType; this permits more flexibility in representation and also supports referring to a value fixed elsewhere;
-	the interval uses gml:TimeIntervalLengthType.

Element information



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:DefinitionBaseType

Used in

Substitution hierarchy

Sample instance

<gml:TimeCoordinateSystem gml:id="ID">
      <gml:GenericMetaData>Any text, intermingled with:
         <!--any element-->
   <gml:identifier codeSpace="">string</gml:identifier>
   <gml:interval unit="year">1.0</gml:interval>