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