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="NG_900/9-3_Vacuum_Lines" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3" ns="0" title="NG 900/9-3" />
      <page pageid="73" ns="0" title="NG 900/9-3 Alternator" />
      <page pageid="53" ns="0" title="NG 900/9-3 Alternator Replacement" />
      <page pageid="79" ns="0" title="NG 900/9-3 Audio" />
      <page pageid="341" ns="0" title="NG 900/9-3 Changing Manual Transmission" />
      <page pageid="573" ns="0" title="NG 900/9-3 Changing Transmission" />
      <page pageid="78" ns="0" title="NG 900/9-3 DIY Rear Seat Cable Fix" />
      <page pageid="92" ns="0" title="NG 900/9-3 Foglight Fix" />
      <page pageid="74" ns="0" title="NG 900/9-3 Front Window Replacement" />
      <page pageid="54" ns="0" title="NG 900/9-3 Throttle Body" />
    </pages>
  </query>
</api>