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XML marked up text
<article>
 <title> All Data is Metadata: </title>
 <subtitle>Rich Architectures for Rich
Resources</subtitle>
 <section>
  <para> Let's skip <emph>straight</emph> to an
example of XML syntax for a simple bit of
structure:</para>
  <example> &lt;tip>&lt;emph>Never&lt;/emph> stand
up in a canoe!&lt;/tip></example>
  </para>
 </section>
</article>