gml:TimeReferenceSystem 

A reference system is characterized in terms of its domain of validity: the spatial and temporal extent over which it is applicable. The basic GML element for temporal reference systems is gml:TimeReferenceSystem.  Its content model extends gml:DefinitionType with one additional property, gml:domainOfValidity.

Element Information

Model

gml:metaDataProperty* , gml:description{0,1} , gml:descriptionReference{0,1} , gml:identifier , gml:name* , gml:remarks{0,1} , gml:domainOfValidity
Children: gml:description, gml:descriptionReference, gml:domainOfValidity, gml:identifier, gml:metaDataProperty, gml:name, gml:remarks

Attributes

QName Type Fixed Default Use Inheritable Annotation
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.

Source 

<element name="TimeReferenceSystem" type="gml:TimeReferenceSystemType" substitutionGroup="gml:Definition">
  <annotation>
    <documentation>A reference system is characterized in terms of its domain of validity: the spatial and temporal extent over which it is applicable. The basic GML element for temporal reference systems is gml:TimeReferenceSystem. Its content model extends gml:DefinitionType with one additional property, gml:domainOfValidity.</documentation>
  </annotation>
</element>

Sample