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="3dofarm6.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="490" ns="6" title="File:13062327 10154146266649579 763269854887388478 n.jpg" />
      <page pageid="638" ns="6" title="File:18318278 1483896414988390 196739901 o.jpg">
        <duplicatefiles>
          <df name="Team.jpg" user="Tsohrab" timestamp="2017-05-05T16:13:09Z" />
        </duplicatefiles>
      </page>
      <page pageid="168" ns="6" title="File:2.png" />
      <page pageid="677" ns="6" title="File:2kw-motor-controller-running.jpg" />
      <page pageid="261" ns="6" title="File:3D printed kinect mount.png" />
      <page pageid="774" ns="6" title="File:3dofarm1.jpg" />
      <page pageid="775" ns="6" title="File:3dofarm2.jpg" />
      <page pageid="776" ns="6" title="File:3dofarm3.jpg" />
      <page pageid="777" ns="6" title="File:3dofarm4.jpg" />
      <page pageid="778" ns="6" title="File:3dofarm5.jpg" />
    </pages>
  </query>
</api>