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="Canvas_code" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="By that time" missing="" />
      <page pageid="1957" ns="0" title="Background notes on SL" />
      <page pageid="1432" ns="0" title="Backups" />
      <page pageid="2072" ns="0" title="BeatBox Hero" />
      <page pageid="3002" ns="0" title="Bink video conversion" />
      <page pageid="3055" ns="0" title="C" />
      <page pageid="2177" ns="0" title="CCRMA IPL Studio C User Guide" />
      <page pageid="1596" ns="0" title="CCRMA Stage Guidelines" />
      <page pageid="1342" ns="0" title="CCRMA Studio Guides" />
      <page pageid="1341" ns="0" title="CCRMA User Group" />
    </pages>
  </query>
</api>