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>
    <allpages apcontinue="Технические_вопросы" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="10" ns="0" title="BISV-NET Diagnostic" />
      <p pageid="31" ns="0" title="BISV-NET Fizschema" />
      <p pageid="26" ns="0" title="BISV-NET VPN" />
      <p pageid="3" ns="0" title="FAQ" />
      <p pageid="6" ns="0" title="HowTo" />
      <p pageid="14" ns="0" title="Linux IPv6" />
      <p pageid="7" ns="0" title="VPN:Linux" />
      <p pageid="1" ns="0" title="Заглавная страница" />
      <p pageid="2" ns="0" title="Организационные вопросы" />
      <p pageid="8" ns="0" title="Решение проблем" />
    </allpages>
  </query>
</api>