<position_expression xmlns="http://www.sqlparser.com/xml/ansi2003"> <character_position_expression>{1,1}</character_position_expression> <binary_position_expression>{1,1}</binary_position_expression> </position_expression>
<xs:element name="position_expression"> <xs:complexType> <xs:choice> <xs:element ref="character_position_expression"/> <xs:element ref="binary_position_expression"/> </xs:choice> </xs:complexType> </xs:element>