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="アテフ冠|11" />
  </query-continue>
  <query>
    <pages>
      <page pageid="9" ns="0" title="メソポタミア神話" />
      <page pageid="10" ns="0" title="古代エジプト神話" />
      <page pageid="14" ns="0" title="ニンリル" />
      <page pageid="49" ns="0" title="トレプシュ" />
      <page pageid="130" ns="0" title="サバジオス" />
      <page pageid="148" ns="0" title="メヘト-ウェレット" />
      <page pageid="155" ns="0" title="シャウシュカ" />
      <page pageid="174" ns="0" title="狩人のパレット" />
    </pages>
  </query>
</api>