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>
    <allredirects garcontinue="Battle_Chef_Coat" />
  </query-continue>
  <query>
    <pages>
      <page pageid="5144" ns="0" title="Barbarous Thorn Blade" />
      <page pageid="5152" ns="0" title="Barbarous Thorn Shield" />
      <page pageid="8091" ns="0" title="Barrel Belly" />
      <page pageid="450" ns="0" title="Battle Arena" />
      <page pageid="38481" ns="0" title="Battle Arena (mission)/Eternal Struggle" />
      <page pageid="38459" ns="0" title="Battle Arena (mission)/Showdown" />
      <page pageid="38477" ns="0" title="Battle Arena (mission)/The Bitter Battle" />
      <page pageid="38474" ns="0" title="Battle Arena (mission)/The Oozing Onslaught" />
      <page pageid="59116" ns="0" title="Battle Boar Helmet" />
      <page pageid="59132" ns="0" title="Battle Boar Suit" />
    </pages>
  </query>
</api>