| diagram | 
					  | 
				
				
					| namespace | 
					http://www.opengis.net/gml/3.2 | 
				
				
					| type | 
					gml:TimeReferenceSystemType | 
				
				
					| properties | 
					| content  | complex |  | substGrp  | gml:Definition |  
  | 
				
				
					| children | 
					gml:metaDataProperty gml:description gml:descriptionReference gml:identifier gml:name gml:remarks gml:domainOfValidity | 
				
				
					| used by | 
					 | 
				
				
					| attributes | 
					| Name   | Type   | Use   | Default   | Fixed   | annotation |  | id | ID | required   |    |    | | documentation |  | 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. |  
  |  
  | 
				
				
					| 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. |  
  | 
				
				
					| 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> |