You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information.
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaicontinue="140319_AL_ANAERO_1.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2191" ns="6" title="File:07 phytoplancton camp.2014.pdf" />
      <page pageid="2655" ns="6" title="File:10-12-46.jpg" />
      <page pageid="2654" ns="6" title="File:10-14-05.jpg" />
      <page pageid="2138" ns="6" title="File:10255604 506507922854294 4593501144637270721 n.jpg">
        <duplicatefiles>
          <df name="MossHunting1.jpg" user="Vlorenzo" timestamp="2016-01-28T12:01:45Z" />
        </duplicatefiles>
      </page>
      <page pageid="2139" ns="6" title="File:11214077 506507942854292 4171224521951999299 n.jpg" />
      <page pageid="2140" ns="6" title="File:12418083 506507846187635 8168903662076309295 n.jpg" />
      <page pageid="2141" ns="6" title="File:12540771 506525886185831 4224237149878779758 n.jpg">
        <duplicatefiles>
          <df name="MossPhone.jpg" user="Vlorenzo" timestamp="2016-01-28T12:05:44Z" />
        </duplicatefiles>
      </page>
      <page pageid="2713" ns="6" title="File:140319 AL AERO 1.jpg" />
      <page pageid="2714" ns="6" title="File:140319 AL AERO 2.jpg" />
      <page pageid="2715" ns="6" title="File:140319 AL AERO 3.jpg" />
    </pages>
  </query>
</api>