<common_value_expression xmlns="http://www.sqlparser.com/xml/ansi2003">
  <numeric_value_expression>{1,1}</numeric_value_expression>
  <string_value_expression>{1,1}</string_value_expression>
  <datetime_value_expression>{1,1}</datetime_value_expression>
  <interval_value_expression>{1,1}</interval_value_expression>
  <user_defined_type_value_expression>{1,1}</user_defined_type_value_expression>
  <reference_value_expression>{1,1}</reference_value_expression>
  <collection_value_expression>{1,1}</collection_value_expression>
</common_value_expression>

<xs:element name="common_value_expression">
  <xs:complexType>
    <xs:choice>
      <xs:element ref="numeric_value_expression"/>
      <xs:element ref="string_value_expression"/>
      <xs:element ref="datetime_value_expression"/>
      <xs:element ref="interval_value_expression"/>
      <xs:element ref="user_defined_type_value_expression"/>
      <xs:element ref="reference_value_expression"/>
      <xs:element ref="collection_value_expression"/>
    </xs:choice>
  </xs:complexType>
</xs:element>