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"?>
    <allpages gapcontinue="baserCMS_の特徴を知りたい" />
      <page pageid="432" ns="0" title="Twitterを表示させたい" contentmodel="wikitext" pagelanguage="ja" touched="2016-03-24T06:53:44Z" lastrevid="1163" counter="1828" length="2730" />
      <page pageid="260" ns="0" title="URLに含まれるindex.phpを無くしたい" contentmodel="wikitext" pagelanguage="ja" touched="2014-11-09T14:52:07Z" lastrevid="622" counter="900" length="329" new="" />
      <page pageid="394" ns="0" title="Webシステム開発におけるメリット・デメリット" contentmodel="wikitext" pagelanguage="ja" touched="2016-09-18T09:32:24Z" lastrevid="2097" counter="4606" length="2245" />
      <page pageid="390" ns="0" title="XAMPP" contentmodel="wikitext" pagelanguage="ja" touched="2016-09-18T09:33:14Z" lastrevid="2098" counter="4120" length="2914" />