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="Beijing_Redflag_Chinese_2000_Software_Co.,_Ltd.|5232" />
  </query-continue>
  <query>
    <pages>
      <page pageid="15957" missing="" />
      <page pageid="5231" ns="0" title="CH2000" />
      <page pageid="7972" ns="0" title="OpenOffice.org Base. Общие вопросы" />
      <page pageid="8131" ns="0" title="Ru/FAQ/Base" />
      <page pageid="10911" ns="0" title="Bn.openoffice.org/Security/Security bn" />
      <page pageid="15988" ns="0" title="Bg/Extensions" />
      <page pageid="15989" ns="0" title="Bg/Documentation/DevGuide/FirstSteps/First Steps" />
      <page pageid="25985" ns="0" title="Ru/Documentation/Base/ListBox" />
      <page pageid="26096" ns="0" title="Base: Самодельная фильтрация в формах" />
      <page pageid="27204" ns="0" title="Security/Security bn" />
    </pages>
  </query>
</api>