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="心詩:2016_總統選舉前夕" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="1" ns="0" title="Main Page" />
      <p pageid="385" ns="0" title="Q版:鴻文" />
      <p pageid="780" ns="0" title="奧義 Esotericism 奥義 - 鄭鴻文 藝術作品" />
      <p pageid="71" ns="0" title="張大千" />
      <p pageid="442" ns="0" title="心詩" />
      <p pageid="431" ns="0" title="心詩:(A)2016熊本地震 2016 Kumamoto earthquake" />
      <p pageid="509" ns="0" title="心詩:2012北京行" />
      <p pageid="481" ns="0" title="心詩:2015冬感遇" />
      <p pageid="469" ns="0" title="心詩:2015食品安全風暴" />
      <p pageid="463" ns="0" title="心詩:2016 台灣總統選舉 投開票日" />
    </allpages>
  </query>
</api>