gmd:extent

Element information

Content

• Choice [1..1]
  from subst. group gml:AbstractTimeGeometricPrimitive
  gml:TimeInstant [0..1]    gml:TimeInstant acts as a zero-dimensional geometric primitive that represents an identifiable position in time.
  gml:TimePeriod [0..1]    gml:TimePeriod acts as a one-dimensional geometric primitive that represents an identifiable extent in time. The location in of a gml:TimePeriod is described by the temporal positions of the instants at which it begins and ends. The length of the period is equal to the temporal distance between the two bounding temporal positions. Both beginning and end may be described in terms of their direct position using gml:TimePositionType which is an XML Schema simple content type, or by reference to an indentifiable time instant using gml:TimeInstantPropertyType. Alternatively a limit of a gml:TimePeriod may use the conventional GML property model to make a reference to a time instant described elsewhere, or a limit may be indicated as a direct position.
  from subst. group gml:AbstractTimeTopologyPrimitive
  gml:TimeNode [0..1]    A time node is a zero-dimensional topological primitive that represents an identifiable node in time (it is equivalent to a point in space). A node may act as the termination or initiation of any number of time edges. A time node may be realised as a geometry, its position, whose value is a time instant.
  gml:TimeEdge [0..1]    A time edge is a one-dimensional topological primitive. It is an open interval that starts and ends at a node. The edge may be realised as a geometry whose value is a time period.

Attributes

Used in

• Type gmd:EX_TemporalExtent_Type (Element gmd:EX_TemporalExtent)
• Type gmd:EX_SpatialTemporalExtent_Type via extension of gmd:EX_TemporalExtent_Type (Element gmd:EX_SpatialTemporalExtent)

Sample instance

<gmd:extent>
   <gml:TimeInstant gml:id="ID">
      <gml:metaDataProperty>
         <gml:GenericMetaData>Any text, intermingled with:...
         </gml:GenericMetaData>
      </gml:metaDataProperty>
      <gml:description>string</gml:description>
      <gml:descriptionReference/>
      <gml:identifier codeSpace="http://www.example.com/">string</gml:identifier>
      <gml:name>string</gml:name>
      <gml:relatedTime>
         <gml:TimeInstant gml:id="ID">...
         </gml:TimeInstant>
      </gml:relatedTime>
      <gml:timePosition>12:00:00</gml:timePosition>
   </gml:TimeInstant>
</gmd:extent>