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>
    <alllinks galcontinue="Characters" />
  </query-continue>
  <query>
    <pages>
      <page pageid="58" ns="0" title="Background Music" />
      <page pageid="84" ns="0" title="Balancing.json" />
      <page pageid="35" ns="0" title="Camera Move Action" />
      <page pageid="38" ns="0" title="Camera Return Action" />
      <page pageid="57" ns="0" title="Change Layer Visibility Action" />
      <page pageid="40" ns="0" title="Change Object Status Action" />
      <page pageid="123" ns="0" title="CharacterPortraits" />
      <page pageid="43" ns="0" title="Character Pickup Action" />
      <page pageid="122" ns="0" title="Character Pickup Tutorial" />
      <page pageid="92" ns="0" title="Character Unit Files" />
    </pages>
  </query>
</api>