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>
    <recentchanges rccontinue="20150215062643|17" />
  </query-continue>
  <query>
    <recentchanges>
      <rc type="edit" ns="0" title="Windows Tips" pageid="2" revid="26" old_revid="3" rcid="27" timestamp="2015-03-02T15:26:07Z" />
      <rc type="new" ns="2" title="利用者:Naota" pageid="16" revid="25" old_revid="0" rcid="26" timestamp="2015-02-16T08:05:24Z" />
      <rc type="edit" ns="0" title="連立一次方程式" pageid="15" revid="24" old_revid="23" rcid="25" timestamp="2015-02-15T10:15:44Z" />
      <rc type="new" ns="0" title="連立一次方程式" pageid="15" revid="23" old_revid="0" rcid="24" timestamp="2015-02-15T10:13:31Z" />
      <rc type="edit" ns="0" title="数値解析" pageid="5" revid="22" old_revid="17" rcid="23" timestamp="2015-02-15T10:11:53Z" />
      <rc type="edit" ns="0" title="プログラミング言語、処理系" pageid="10" revid="21" old_revid="19" rcid="22" timestamp="2015-02-15T10:06:43Z" />
      <rc type="new" ns="0" title="OpenMP並列プログラミング" pageid="14" revid="20" old_revid="0" rcid="21" timestamp="2015-02-15T10:03:38Z" />
      <rc type="edit" ns="0" title="プログラミング言語、処理系" pageid="10" revid="19" old_revid="12" rcid="20" timestamp="2015-02-15T10:00:32Z" />
      <rc type="new" ns="0" title="Αβ型漸化式" pageid="13" revid="18" old_revid="0" rcid="19" timestamp="2015-02-15T09:51:30Z" />
      <rc type="edit" ns="0" title="数値解析" pageid="5" revid="17" old_revid="6" rcid="18" timestamp="2015-02-15T09:47:20Z" />
    </recentchanges>
  </query>
</api>