<para>The <function>sd_journal_query_unique()</function>,
<function>sd_journal_enumerate_unique()</function> and
<function>sd_journal_restart_unique()</function>
<para>The <function>sd_journal_query_unique()</function>,
<function>sd_journal_enumerate_unique()</function> and
<function>sd_journal_restart_unique()</function>