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="NewArticle|2" />
  </query-continue>
  <query>
    <pages>
      <page pageid="6" ns="0" title="e-Tax" />
      <page pageid="7" ns="0" title="住民基本台帳カード" />
      <page pageid="28" ns="0" title="株式投資" />
      <page pageid="37" ns="0" title="ダウ平均株価" />
      <page pageid="42" ns="0" title="ADR" />
      <page pageid="43" ns="0" title="レンジ相場" />
      <page pageid="46" ns="0" title="デッドクロス" />
      <page pageid="52" ns="0" title="ADX" />
      <page pageid="108" ns="0" title="経済用語" />
      <page pageid="139" ns="0" title="米国ETFと税金" />
    </pages>
  </query>
</api>