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 afcontinue="教育自造者計畫預算表.png" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="檔案:Example.jpg" />
      <f ns="6" title="檔案:File.ogg" />
      <f ns="6" title="檔案:Go top.gif" />
      <f ns="6" title="檔案:PascalTriangleAnimated2.gif" />
      <f ns="6" title="檔案:WP action&amp;filter.png" />
      <f ns="6" title="檔案:平均行政員額分布圖.png" />
      <f ns="6" title="檔案:微型資料中心.jpg" />
      <f ns="6" title="檔案:授課節數調整後尚需員額.jpg" />
      <f ns="6" title="檔案:授課節數調整後尚需外加比率.jpg" />
      <f ns="6" title="檔案:教育自造者計畫期程.png" />
    </allfileusages>
  </query>
</api>