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="2_robot_handling.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="887" ns="6" title="File:0-plan p59 laser cutting area.jpg" />
      <page pageid="700" ns="6" title="File:1-Epi-Prec.jpg" />
      <page pageid="646" ns="6" title="File:1-Puente-impreso-3D.jpg" />
      <page pageid="121" ns="6" title="File:1.JPG">
        <duplicatefiles>
          <df name="Disenio_molde.JPG" user="Nuriarobles" timestamp="2011-01-23T22:58:28Z" />
        </duplicatefiles>
      </page>
      <page pageid="384" ns="6" title="File:1 health insurance 2574.jpg" />
      <page pageid="387" ns="6" title="File:1 health insurance 3405.jpg" />
      <page pageid="885" ns="6" title="File:2- steps valves air pressure.jpg" />
      <page pageid="770" ns="6" title="File:2-finger robot gripper and parallel robot-1.jpg" />
      <page pageid="127" ns="6" title="File:2.jpg" />
      <page pageid="1265" ns="6" title="File:2 MAI 2PUMP PICTOR 3D B Kopie.jpg" />
    </pages>
  </query>
</api>