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