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>
    <pages>
      <page ns="0" title="API" missing="" />
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="Hall" timestamp="2015-03-20T04:44:56Z" comment="/* This is Hall&#039;s wiki page */" contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">Welcome to Hawk Wiki

===This wiki is READ ONLY===
Please do not register account
== Highlights ==
This wiki is mainly designed for Pro tips and Best Practices.

==Popular Links==
* [[FFMPEG Commands|FFMPEG Commands]]&lt;br&gt;
* [[FFMPEG Development|FFMPEG Development]]&lt;br&gt;
* [[JavaScript devel|JavaScript devel]]&lt;br&gt;
* [[Ruby on Rails | Ruby on Rails]]&lt;br&gt;
* [[Linux Administration | Linux Admin]]&lt;br&gt;
* [[Interview Questions | Interview Questions]]&lt;br&gt;
* [[Reverse Engineering | Reverse Engineering]]&lt;br&gt;
* [[Wiki commands|Wiki commands]]&lt;br&gt;
* [[Site Map]]</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>