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>
    <allfileusages gafcontinue="Diamond_House(shanghai)豈止於愛1.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="28" ns="6" title="檔案:Chinaa11.gif" />
      <page pageid="154" ns="6" title="檔案:Converse品牌.jpg" />
      <page pageid="155" ns="6" title="檔案:Cushe品牌.jpg" />
      <page pageid="1564" ns="6" title="檔案:Diamond House(beijing)豈止於愛1.jpg" />
      <page pageid="1565" ns="6" title="檔案:Diamond House(beijing)豈止於愛2.jpg" />
      <page pageid="1566" ns="6" title="檔案:Diamond House(beijing)豈止於愛3.jpg" />
      <page pageid="1567" ns="6" title="檔案:Diamond House(beijing)豈止於愛4.jpg" />
      <page pageid="1568" ns="6" title="檔案:Diamond House(beijing)豈止於愛5.jpg" />
      <page pageid="1569" ns="6" title="檔案:Diamond House(beijing)豈止於愛6.jpg" />
      <page pageid="1570" ns="6" title="檔案:Diamond House(beijing)豈止於愛7.jpg" />
    </pages>
  </query>
</api>