<unicode_identifier_part xmlns="http://www.sqlparser.com/xml/ansi2003">
  <delimited_identifier_part>{1,1}</delimited_identifier_part>
  <unicode_escape_value>{1,1}</unicode_escape_value>
</unicode_identifier_part>

<xs:element name="unicode_identifier_part">
  <xs:complexType>
    <xs:choice>
      <xs:element ref="delimited_identifier_part"/>
      <xs:element ref="unicode_escape_value"/>
    </xs:choice>
  </xs:complexType>
</xs:element>