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>
    <alltransclusions gatcontinue="Battery_pinout_abbreviations|149" />
  </query-continue>
  <query>
    <pages>
      <page pageid="84" ns="0" title="Nokia BL-4C battery pinout" />
      <page pageid="86" ns="0" title="Nokia BL-5B battery pinout" />
      <page pageid="87" ns="0" title="Nokia BL-5CA battery pinout" />
      <page pageid="114" ns="0" title="Nokia BL-4S battery pinout" />
      <page pageid="118" ns="0" title="Samsung AB483640BU battery pinout" />
      <page pageid="122" ns="0" title="Samsung AB483640DE battery pinout" />
      <page pageid="126" ns="0" title="Samsung AB503442CE battery pinout" />
      <page pageid="131" ns="0" title="Samsung AB603443CU battery pinout" />
      <page pageid="135" ns="0" title="Nokia BL-5J battery pinout" />
      <page pageid="144" ns="0" title="Sonyericsson BST-36 battery pinout" />
    </pages>
  </query>
</api>