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 atcontinue="LG_battery_notes" />
  </query-continue>
  <query>
    <alltransclusions>
      <t ns="10" title="Template:Battery pinout abbreviations" />
      <t ns="10" title="Template:BlacBerry battery seealso" />
      <t ns="10" title="Template:BlackBerry battery notes" />
      <t ns="10" title="Template:BlackBerry battery pinout seealso" />
      <t ns="10" title="Template:BlackBerry battery seealso" />
      <t ns="10" title="Template:ContainerClasses" />
      <t ns="10" title="Template:Ericsson battery notes" />
      <t ns="10" title="Template:Ericsson battery seealso" />
      <t ns="10" title="Template:HTC battery notes" />
      <t ns="10" title="Template:HTC battery seealso" />
    </alltransclusions>
  </query>
</api>