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 gatcontinue="鄭鴻文_書道とアート_詩文|36" />
  </query-continue>
  <query>
    <pages>
      <page pageid="22" ns="0" title="鄭鴻文 詩文" />
      <page pageid="28" ns="0" title="詩文:時" />
      <page pageid="30" ns="0" title="詩文:高雄燈會藝術節" />
      <page pageid="31" ns="0" title="詩文:夢緣" />
      <page pageid="32" ns="0" title="詩文:遠征" />
      <page pageid="33" ns="0" title="詩文:緣思" />
      <page pageid="34" ns="0" title="詩文:故鄉" />
      <page pageid="35" ns="0" title="詩文:浪漫之旅" />
      <page pageid="57" ns="0" title="鄭鴻文 イベント" />
      <page pageid="68" ns="0" title="鄭鴻文 ニュース" />
    </pages>
  </query>
</api>