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 pageid="49" ns="0" title="Main Page">
        <revisions>
          <rev user="Admin" timestamp="2015-04-09T08:26:57Z" comment="새 문서: &lt;p&gt;&lt;strong&gt;&lt;span style=&quot;font-size: large;&quot;&gt;이 페이지는 TRACE32 사용에 대하여 자주 질문하는 내용들을 정리해 놓은 문서입니다.&lt;/span&gt;&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;&amp;nbsp..." />
        </revisions>
      </page>
    </pages>
  </query>
</api>