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>
    <alltransclusions gatcontinue="StarCraft_Trigger|107" />
  </query-continue>
  <query>
    <pages>
      <page pageid="20" ns="0" title="Map Max" />
      <page pageid="40" ns="0" title="Triggers" />
      <page pageid="85" ns="0" title="Bunker Disabling and Stacking" />
      <page pageid="86" ns="0" title="Ordering and using interceptors and scarabs" />
      <page pageid="87" ns="0" title="Hyper Triggers" />
      <page pageid="89" ns="0" title="Kills to cash" />
      <page pageid="104" ns="0" title="Automatic Doors" />
      <page pageid="105" ns="0" title="Playing a Sound When a Unit Walks" />
      <page pageid="172" ns="10" title="Template:Main" />
    </pages>
  </query>
</api>