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>
    <allredirects garcontinue="箱庭諸島_GSの計画一覧" />
  </query-continue>
  <query>
    <pages>
      <page pageid="185" ns="0" title="Hakoniwa R.A.の計画一覧" />
      <page pageid="433" ns="0" title="いのらSP" />
      <page pageid="36" ns="0" title="奇獣スライム" />
      <page pageid="721" ns="0" title="怪獣" />
      <page pageid="405" ns="0" title="援助系計画" />
      <page pageid="304" ns="0" title="派遣系計画" />
      <page pageid="869" ns="0" title="海賊船" />
      <page pageid="781" ns="0" title="港" />
      <page pageid="393" ns="0" title="究想の箱庭の計画一覧" />
      <page pageid="518" ns="0" title="箱庭諸島MI" />
    </pages>
  </query>
</api>