<type>ltree</type>?
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>&lt;@</literal> <type>ltree</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para role="func_signature">
        <type>ltree</type> <literal>@&gt;</literal> <type>ltree[]</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Does array contain a descendant of <type>ltree</type>?
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>~</literal> <type>lquery</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para role="func_signature">
        <type>lquery</type> <literal>~</literal> <type>ltree[]</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Does array contain any path matching <type>lquery</type>?
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>?</literal> <type>lquery[]</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para role="func_signature">
        <type>lquery[]</type> <literal>?</literal> <type>ltree[]</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Does <type>ltree</type> array contain any path matching
        any <type>lquery</type>?
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>@</literal> <type>ltxtquery</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para role="func_signature">
        <type>ltxtquery</type> <literal>@</literal> <type>ltree[]</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Does array contain any path matching <type>ltxtquery</type>?
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>?@&gt;</literal> <type>ltree</type>
        <returnvalue>ltree</returnvalue>
       </para>
       <para>
        Returns first array entry that is an ancestor of <type>ltree</type>,
        or <literal>NULL</literal> if none.
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>?&lt;@</literal> <type>ltree</type>
        <returnvalue>ltree</returnvalue>
       </para>
       <para>
        Returns first array entry that is a descendant of <type>ltree</type>,
        or <literal>NULL</literal> if none.
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>?~</literal> <type>lquery</type>
        <returnvalue>ltree</returnvalue>
       </para>
       <para>
        Returns first array entry that matches <type>lquery</type>,
        or <literal>NULL</literal> if none.
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>ltree[]</type> <literal>?@</literal> <type>ltxtquery</type>
        <returnvalue>ltree</returnvalue>
       </para>
       <para>
        Returns first array entry that matches <type>ltxtquery</type>,
        or <literal>NULL</literal> if none.
       </para></entry>
      </row>
     </tbody>
    </tgroup>
  </table>

  <para>
   The operators <literal>&lt;@</literal>, <literal>@&gt;</literal>,
   <literal>@</literal> and <literal>~</literal> have analogues
   <literal>^&lt;@</literal>, <literal>^@&gt;</literal>, <literal>^@</literal>,
   <literal>^~</literal>, which are the same except they do not use
   indexes.  These are useful only for testing purposes.
  </para>

  <para>
   The available functions are