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