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.
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.
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<element name="TimeCoordinateSystem" type="gml:TimeCoordinateSystemType" substitutionGroup="gml:TimeReferenceSystem"><annotation><documentation>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.</documentation></annotation></element>