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Diagrams
Source
Used by
Simple Type gml:TimePositionUnion
Namespace http://www.opengis.net/gml
Annotations
The ISO 19108:2002 hierarchy of subtypes for temporal position are collapsed 
by defining a union of XML Schema simple types for indicating temporal position relative 
to a specific reference system. 
      
Dates and dateTime may be indicated with varying degrees of precision.  
dateTime by itself does not allow right-truncation, except for fractions of seconds. 
When used with non-Gregorian calendars based on years, months, days, 
the same lexical representation should still be used, with leading zeros added if the 
year value would otherwise have fewer than four digits.  
      
An ordinal position may be referenced via URI identifying the definition of an ordinal era.  
      
A time coordinate value is indicated as a decimal (e.g. UNIX time, GPS calendar).
Diagram
Diagram docindex511.tmp#id342
Type union of(gml:CalDate, time, dateTime, anyURI, decimal)
Used by
Complex Type gml:TimePositionType
Source
<simpleType name="TimePositionUnion">
  <annotation>
    <documentation xml:lang="en">The ISO 19108:2002 hierarchy of subtypes for temporal position are collapsed by defining a union of XML Schema simple types for indicating temporal position relative to a specific reference system. Dates and dateTime may be indicated with varying degrees of precision. dateTime by itself does not allow right-truncation, except for fractions of seconds. When used with non-Gregorian calendars based on years, months, days, the same lexical representation should still be used, with leading zeros added if the year value would otherwise have fewer than four digits. An ordinal position may be referenced via URI identifying the definition of an ordinal era. A time coordinate value is indicated as a decimal (e.g. UNIX time, GPS calendar).</documentation>
  </annotation>
  <union memberTypes="gml:CalDate time dateTime anyURI decimal"/>
</simpleType>
Schema location http://schemas.opengis.net/gml/3.1.1/base/temporal.xsd