You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaifrom="0ad-screenshot02.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="26472" ns="6" title="文件:001.jpg" />
      <page pageid="6412" ns="6" title="文件:0100 0360.jpg" />
      <page pageid="3645" ns="6" title="文件:01 cmb 88x31.gif" />
      <page pageid="3646" ns="6" title="文件:02 ccb 88x31.gif" />
      <page pageid="3647" ns="6" title="文件:03 icbc 88x31.gif" />
      <page pageid="3648" ns="6" title="文件:04 bc 88x31.gif" />
      <page pageid="3649" ns="6" title="文件:05 cmsb 88x31.gif" />
      <page pageid="3650" ns="6" title="文件:06 abc 88x31.gif" />
      <page pageid="3651" ns="6" title="文件:07 cp 88x31.gif" />
      <page pageid="83563" ns="6" title="文件:0ad-screenshot01.png" />
    </pages>
  </query>
</api>