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>
    <alllinks galcontinue="Cacti/cactiインストールメモ" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="BracketName" missing="" />
      <page pageid="2516" ns="0" title="Blender/Fbx" />
      <page pageid="2389" ns="0" title="Blender/helloworld" />
      <page pageid="2388" ns="0" title="Blender/インストール" />
      <page pageid="2391" ns="0" title="Blender/オブジェクト" />
      <page pageid="2390" ns="0" title="Blender/基本" />
      <page pageid="2392" ns="0" title="Blender/描画" />
      <page pageid="216" ns="0" title="Cacti" />
      <page pageid="692" ns="0" title="Cacti/apacheレスポンス集計" />
      <page pageid="188" ns="0" title="Cacti/apache監視インストール" />
    </pages>
  </query>
</api>