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>
    <allpages apcontinue="Chinese_Poem:2016_台灣總統選舉_投開票日" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="49" ns="0" title="Cheng Hung-Wen Biography" />
      <p pageid="10" ns="0" title="Cheng Hung-Wen Chinese Poem" />
      <p pageid="52" ns="0" title="Cheng Hung-Wen News" />
      <p pageid="45" ns="0" title="Cheng Hung-Wen Video" />
      <p pageid="118" ns="0" title="Cheng Hung-Wen Videos" />
      <p pageid="119" ns="0" title="Cheng Hung-Wen big events" />
      <p pageid="542" ns="0" title="Cheng Hung-Wen。The spiritual power of poem" />
      <p pageid="44" ns="0" title="Chinese Poem:2012北京行" />
      <p pageid="230" ns="0" title="Chinese Poem:2015冬感遇" />
      <p pageid="238" ns="0" title="Chinese Poem:2015食品安全風暴" />
    </allpages>
  </query>
</api>