<general_literal xmlns="http://www.sqlparser.com/xml/ansi2003">
  <character_string_literal>{1,1}</character_string_literal>
  <national_character_string_literal>{1,1}</national_character_string_literal>
  <unicode_character_string_literal>{1,1}</unicode_character_string_literal>
  <binary_string_literal>{1,1}</binary_string_literal>
  <datetime_literal>{1,1}</datetime_literal>
  <interval_literal>{1,1}</interval_literal>
  <boolean_literal>{1,1}</boolean_literal>
</general_literal>

<xs:element name="general_literal">
  <xs:complexType>
    <xs:choice>
      <xs:element ref="character_string_literal"/>
      <xs:element ref="national_character_string_literal"/>
      <xs:element ref="unicode_character_string_literal"/>
      <xs:element ref="binary_string_literal"/>
      <xs:element ref="datetime_literal"/>
      <xs:element ref="interval_literal"/>
      <xs:element ref="boolean_literal"/>
    </xs:choice>
  </xs:complexType>
</xs:element>