Selected elements

Mountain spring

<figure >
  <title>Mountain spring</title>
  <mediaobject>
    <imageobject>
      <imagedata fileref=
        "Ref/DbookIntro/mountain.jpg"/>
    </imageobject>
  </mediaobject>
</figure>

.

<mediaobject>
  <imageobjectco>
    <areaspec ...>
      <area coords="83,16,340,187"
          xml:id="a1" linkends="c1"/>
      ...
    </areaspec>
    <imageobject>
      <imagedata fileref="recumbent.png.svg"/>
    </imageobject>
    <calloutlist>
      <callout arearefs="a1" xml:id="c1">
        <para>Seat</para>
      </callout>
      <callout arearefs="a1 a2" xml:id="c1">
        <para>Valves</para>
      </callout>
    </calloutlist>
  </imageobjectco>
</mediaobject>

Video courtesy of Big Buck Bunny.

<videoobject>
  <videodata
     fileref="buckBunny.mp4"
      format="video/mp4">
    <multimediaparam
          name="controls"
         value="controls"/>
  </videodata>
</videoobject>