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>
    <protectedtitles>
      <pt ns="1" title="トーク:Top" timestamp="2013-04-26T11:51:49Z" level="sysop" />
      <pt ns="4" title="AutoHotkey Wiki:ビューロクラット" timestamp="2013-04-03T19:05:47Z" level="sysop" />
      <pt ns="4" title="AutoHotkey Wiki:ボット" timestamp="2013-04-03T19:05:07Z" level="sysop" />
      <pt ns="3" title="利用者・トーク:不正利用フィルター" timestamp="2013-02-19T04:21:55Z" level="sysop" />
      <pt ns="2" title="利用者:不正利用フィルター" timestamp="2013-02-19T04:21:42Z" level="sysop" />
      <pt ns="5" title="AutoHotkey Wiki・トーク:著作権" timestamp="2013-02-17T09:16:16Z" level="sysop" />
      <pt ns="5" title="AutoHotkey Wiki・トーク:免責事項" timestamp="2013-02-17T09:15:56Z" level="sysop" />
      <pt ns="5" title="AutoHotkey Wiki・トーク:プライバシー ポリシー" timestamp="2013-02-17T09:15:10Z" level="sysop" />
      <pt ns="1" title="トーク:メインページ" timestamp="2013-02-17T08:51:17Z" level="autoconfirmed" />
    </protectedtitles>
  </query>
</api>