simpleType CalDate

namespace	http://www.opengis.net/gml
type	union of (xs:date, xs:gYearMonth, xs:gYear)
used by	simpleType  TimePositionUnion
annotation	documentation Calendar dates may be indicated with varying degrees of precision,       using year, year-month, date.       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.        time is used for a position that recurs daily (see clause 5.4.4.2 of ISO 19108:2002).
source	<xs:simpleType name="CalDate">   <xs:annotation>     <xs:documentation xml:lang="en">Calendar dates may be indicated with varying degrees of precision,       using year, year-month, date.       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.        time is used for a position that recurs daily (see clause 5.4.4.2 of ISO 19108:2002).</xs:documentation>   </xs:annotation>   <xs:union memberTypes="date gYearMonth gYear"/> </xs:simpleType>

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