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>
    <allimages gaicontinue="Cubespace.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4480" ns="6" title="File:1676280 133328083 2 (1).jpg" />
      <page pageid="4130" ns="6" title="File:2013秋 朱房 儿童 第一次 黑皮.docx" />
      <page pageid="4108" ns="6" title="File:2013阳光学生名字牌和反馈表.pdf" />
      <page pageid="4079" ns="6" title="File:2028344873.jpg" />
      <page pageid="4080" ns="6" title="File:2028500017.jpg" />
      <page pageid="4078" ns="6" title="File:4d2a97ea9a108.jpg" />
      <page pageid="4123" ns="6" title="File:Ambox notice.png" />
      <page pageid="4026" ns="6" title="File:Block msg.png" />
      <page pageid="4016" ns="6" title="File:Cafe logo.png" />
      <page pageid="2" ns="6" title="File:Challange12.png" />
    </pages>
  </query>
</api>