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>
    <allpages gapcontinue="ガバガバLinuxコマンド" />
  </query-continue>
  <query>
    <pages>
      <page pageid="470" ns="0" title="WindowsServerへのIntelNICドライバインストール方法" contentmodel="wikitext" pagelanguage="ja" touched="2017-01-13T22:41:10Z" lastrevid="1999" counter="6699" length="1488" new="" />
      <page pageid="429" ns="0" title="アクアリウムってなに？" contentmodel="wikitext" pagelanguage="ja" touched="2017-04-28T12:07:15Z" lastrevid="2046" counter="28159" length="3193" />
      <page pageid="369" ns="0" title="アレンジから入るDTM入門" contentmodel="wikitext" pagelanguage="ja" touched="2015-09-03T18:31:38Z" lastrevid="1585" counter="20393" length="5633" />
      <page pageid="200" ns="0" title="ガバガバCPU解説" contentmodel="wikitext" pagelanguage="ja" touched="2015-06-02T18:11:51Z" lastrevid="964" counter="60585" length="5139" />
    </pages>
  </query>
</api>