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>
    <allfileusages gafcontinue="Batch_sparging_grain_weight.gif" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1871" ns="6" title="File:BSPGS 1st and 2nd run off.gif" />
      <page pageid="1872" ns="6" title="File:BSPGS 1st recharge.gif" />
      <page pageid="1873" ns="6" title="File:BSPGS 1st run off.gif" />
      <page pageid="1874" ns="6" title="File:BSPGS boil off.gif" />
      <page pageid="1875" ns="6" title="File:BSPGS equipment.gif" />
      <page pageid="1876" ns="6" title="File:BSPGS initial mash.gif" />
      <page pageid="1877" ns="6" title="File:BSPGS units.gif" />
      <page pageid="1704" ns="6" title="File:Batch 61 iodine test.jpg" />
      <page pageid="1720" ns="6" title="File:Batch 77 bruchbilder.jpg" />
      <page pageid="1459" ns="6" title="File:Batch sparging efficiency formulas.gif" />
    </pages>
  </query>
</api>