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