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<article xmlns="http://docbook.org/ns/docbook">
  <orderedlist>
    <listitem>
      <para>Item 1</para>
    </listitem>
    <listitem>
      <orderedlist>
        <listitem>
          <para>Item 1.1</para>
        </listitem>
      </orderedlist>
    </listitem>
    <listitem>
      <para>Item 2</para>
    </listitem>
    <listitem>
      <para>Blanks</para>
    </listitem>
    <listitem>
      <orderedlist>
        <listitem>
          <para>are also</para>
        </listitem>
      </orderedlist>
    </listitem>
    <listitem>
      <para>allowed.</para>
    </listitem>
  </orderedlist>
</article>
