XRef -- A cross reference to another part of the document.

Chapter 2, listitem, orderlist

Chapter 3, external link, graphics

Chapter 4, text

  <sect1><title>xref tag</title>
    <para>XRef -- A cross reference to another part of the document.</para>
    <para><xref linkend="listorder"/></para>
    <para><xref linkend="ext"/></para>
    <para><xref linkend="text"/></para>
  </sect1>
      >