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>
    <images imcontinue="1|鄭鴻文Cheng_Hung_Wen(twitter).jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <images>
          <im ns="6" title="File:100bannertest.jpg" />
          <im ns="6" title="File:Cheng Hung Wen(Calligraphy &amp; ART)201501a002.jpg" />
          <im ns="6" title="File:Cheng Hung Wen(Calligraphy &amp; ART)201501b0001.jpg" />
          <im ns="6" title="File:FTV.jpg" />
          <im ns="6" title="File:JTL.jpg" />
          <im ns="6" title="File:SOTAI.jpg" />
          <im ns="6" title="File:UneedADV.jpg" />
          <im ns="6" title="File:鄭鴻文Cheng Hung Wen(Line).jpg" />
          <im ns="6" title="File:鄭鴻文Cheng Hung Wen(facebook).jpg" />
          <im ns="6" title="File:鄭鴻文Cheng Hung Wen(instagram).jpg" />
        </images>
      </page>
    </pages>
  </query>
</api>