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="Cheng_Hung-Wen_Calligrapher_Calligraphy_&amp;_ART_End01|23" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="10" ns="0" title="Cheng Hung-Wen Chinese Poem" />
      <page pageid="16" ns="0" title="Chinese Poem:時" />
      <page pageid="18" ns="0" title="Chinese Poem:高雄燈會藝術節" />
      <page pageid="19" ns="0" title="Chinese Poem:夢緣" />
      <page pageid="20" ns="0" title="Chinese Poem:遠征" />
      <page pageid="21" ns="0" title="Chinese Poem:緣思" />
      <page pageid="22" ns="0" title="Chinese Poem:故鄉" />
      <page pageid="119" ns="0" title="Cheng Hung-Wen big events" />
      <page pageid="120" ns="10" title="Template:Cheng Hung-Wen Calligrapher Calligraphy &amp; ART big events" />
    </pages>
  </query>
</api>