<datetime_literal xmlns="http://www.sqlparser.com/xml/ansi2003"> <date_literal>{1,1}</date_literal> <time_literal>{1,1}</time_literal> <timestamp_literal>{1,1}</timestamp_literal> </datetime_literal>
<xs:element name="datetime_literal"> <xs:complexType> <xs:choice> <xs:element ref="date_literal"/> <xs:element ref="time_literal"/> <xs:element ref="timestamp_literal"/> </xs:choice> </xs:complexType> </xs:element>