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="2710_nav_ed_pinout.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="6142" ns="6" title="File:01 Samsung Galaxy Tab Pro 8.4 download mode warning.jpg" />
      <page pageid="6143" ns="6" title="File:02 Samsung Galaxy Tab Pro 8.4 download mode.jpg" />
      <page pageid="6144" ns="6" title="File:03 Odin original Samsung T320 firmware loaded.jpg" />
      <page pageid="6145" ns="6" title="File:04 Odin untick auto reboot.jpg" />
      <page pageid="6146" ns="6" title="File:06 Odin recovery flashing.jpg" />
      <page pageid="3393" ns="6" title="File:1100.jpg" />
      <page pageid="1330" ns="6" title="File:12345.JPG" />
      <page pageid="8" ns="6" title="File:1680pinout.jpg" />
      <page pageid="5113" ns="6" title="File:21052012011437 147 thumb ARSDMCL10-16GB.jpg" />
      <page pageid="1328" ns="6" title="File:2700cchargingnotsupport.jpg" />
    </pages>
  </query>
</api>