<entry>level3</entry>
         <entry>Case/Variants</entry>
         <entry><literal>true</literal></entry>
         <entry><literal>true</literal></entry>
         <entry><literal>true</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
        </row>
        <row>
         <entry>level4</entry>
         <entry>Punctuation<footnote><para>only with
         <literal>ka-shifted</literal>; see <xref
         linkend="icu-collation-settings-table"/></para></footnote></entry>
         <entry><literal>true</literal></entry>
         <entry><literal>true</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
        </row>
        <row>
         <entry>identic</entry>
         <entry>All</entry>
         <entry><literal>true</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
         <entry><literal>false</literal></entry>
        </row>
       </tbody>
      </tgroup>
     </table>

    <para>
     At every level, even with full normalization off, basic normalization is
     performed. For example, <literal>'á'</literal> may be composed of the
     code points <literal>U&amp;'\0061\0301'</literal> or the single code
     point <literal>U&amp;'\00E1'</literal>, and those sequences will be
     considered equal even at the <literal>identic</literal> level. To treat
     any difference in code point representation as distinct, use a collation
     created with <symbol>deterministic</symbol> set to
     <literal>true</literal>.
    </para>

    <sect4 id="icu-collation-level-examples">
     <title>Collation Level Examples</title>

<programlisting>
CREATE COLLATION level3 (provider = icu, deterministic = false, locale = 'und-u-ka-shifted-ks-level3');
CREATE COLLATION level4 (provider = icu, deterministic = false, locale = 'und-u-ka-shifted-ks-level4');
CREATE COLLATION identic (provider = icu, deterministic = false, locale = 'und-u-ka-shifted-ks-identic');

-- invisible separator ignored at all levels except identic
SELECT 'ab' = U&amp;'a\2063b' COLLATE level4; -- true
SELECT 'ab' = U&amp;'a\2063b' COLLATE identic; -- false

-- punctuation ignored at level3 but not at level 4
SELECT 'x-y' = 'x_y' COLLATE level3; -- true
SELECT 'x-y' = 'x_y' COLLATE level4; -- false
</programlisting>

    </sect4>
   </sect3>

   <sect3 id="icu-collation-settings">
    <title>Collation Settings for an ICU Locale</title>

    <para>
     <xref linkend="icu-collation-settings-table"/> shows the available
     collation settings, which can be used as part of a language tag to
     customize a collation.
    </para>

     <table id="icu-collation-settings-table">
      <title>ICU Collation Settings</title>
      <tgroup cols="4">
       <colspec colname="col1" colwidth="1*"/>
       <colspec colname="col2" colwidth="2*"/>
       <colspec colname="col3" colwidth="2*"/>
       <colspec colname="col4" colwidth="5*"/>

       <thead>
        <row>
         <entry>Key</entry>
         <entry>Values</entry>
         <entry>Default</entry>
         <entry>Description</entry>
        </row>
       </thead>

       <tbody>
        <row>
         <entry><literal>co</literal></entry>
         <entry><literal>emoji</literal>, <literal>phonebk</literal>, <literal>standard</literal>, <replaceable>...</replaceable></entry>
         <entry><literal>standard</literal></entry>
         <entry>
          Collation type. See <xref linkend="icu-external-references"/> for additional options and details.
         </entry>
        </row>

        <row>
         <entry><literal>ka</literal></entry>
         <entry><literal>noignore</literal>, <literal>shifted</literal></entry>