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>
    <allpages apcontinue="Bose_QuietComfort_35" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="53" ns="0" title="B&amp;W" />
      <p pageid="54" ns="0" title="B&amp;W 805 Diamond" />
      <p pageid="123" ns="0" title="B&amp;W 805 Maserati Edition" />
      <p pageid="132" ns="0" title="BOSE AE2のヘッドフォンのケーブルが断線したので買い換えました" />
      <p pageid="118" ns="0" title="Bluetooth" />
      <p pageid="106" ns="0" title="Bose AE2w Bluetooth headphones" />
      <p pageid="131" ns="0" title="Bose Companion20" />
      <p pageid="113" ns="0" title="Bose Companion 2 Series III multimedia speaker system" />
      <p pageid="121" ns="0" title="Bose M2" />
      <p pageid="112" ns="0" title="Bose QuietComfort 20" />
    </allpages>
  </query>
</api>