Graphics

<mediaobject>
  <imageobject>
    <imagedata fileref="snapshot.jpg" format="JPG"/>
  </imageobject>

  <textobject>
    <phrase>A snapshot of Gnome Calculator.</phrase>
  </textobject>

  <caption>
    <para>Here's a snapshot of the Gnome Calculator program.</para>
  </caption>
</mediaobject>
     

A full example is available here.