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="Main_Page" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="488" ns="0" title="Blender部メモ" />
      <p pageid="473" ns="0" title="CPUベンチマークテスト（動画エンコード）" />
      <p pageid="342" ns="0" title="DeskTopMusic部" />
      <p pageid="471" ns="0" title="FFMPEGメモ" />
      <p pageid="150" ns="0" title="HDDの話" />
      <p pageid="141" ns="0" title="JUNKWIKI" />
      <p pageid="185" ns="0" title="JUNK WIKI:JUNK WIKIについて" />
      <p pageid="184" ns="0" title="JUNK WIKI:プライバシー・ポリシー" />
      <p pageid="183" ns="0" title="JUNK WIKI:免責事項" />
      <p pageid="182" ns="0" title="JUNK WIKI:著作権" />
    </allpages>
  </query>
</api>