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>
    <alltransclusions atcontinue="作品圖片模版ABA0201B|61" />
  </query-continue>
  <query>
    <alltransclusions>
      <t ns="10" title="Template:上標題模組" />
      <t ns="10" title="Template:上標題模組" />
      <t ns="10" title="Template:上標題模組" />
      <t ns="10" title="Template:上標題模組" />
      <t ns="10" title="Template:上標題模組" />
      <t ns="10" title="Template:作品圖片模版ABA0201A上" />
      <t ns="10" title="Template:作品圖片模版ABA0201A上1" />
      <t ns="10" title="Template:作品圖片模版ABA0201A下" />
      <t ns="10" title="Template:作品圖片模版ABA0201A下1" />
      <t ns="10" title="Template:作品圖片模版ABA0201A中" />
    </alltransclusions>
  </query>
</api>