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>
    <templates tlcontinue="1|10|ConfigImageHeader" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <templates>
          <tl ns="0" title="Main Page/About Software" />
          <tl ns="0" title="Main Page/Common Features" />
          <tl ns="0" title="Main Page/Hot Links" />
          <tl ns="0" title="Main Page/Multiple Depth Sensors" />
          <tl ns="0" title="Main Page/Multiple RGB Cameras" />
          <tl ns="0" title="Main Page/Pro Edition Exclusive Features" />
          <tl ns="0" title="Main Page/Single Depth Sensor" />
          <tl ns="0" title="Main Page/Special Features in Basic and Pro Editions" />
          <tl ns="10" title="Template:CommonFeatureItem" />
          <tl ns="10" title="Template:ConfigDescription" />
        </templates>
      </page>
    </pages>
  </query>
</api>