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="Month_Logs" />
  </query-continue>
  <query>
    <pages>
      <page pageid="434" ns="10" title="Template:CTable" />
      <page pageid="5" ns="10" title="Template:Character Infobox" />
      <page pageid="6" ns="10" title="Template:Character List Single" />
      <page pageid="292" ns="10" title="Template:Character Logs" />
      <page pageid="224" ns="10" title="Template:Cutscene Header" />
      <page pageid="7" ns="10" title="Template:Group" />
      <page pageid="384" ns="10" title="Template:Group Members" />
      <page pageid="8" ns="10" title="Template:Location" />
      <page pageid="9" ns="10" title="Template:Log Header" />
      <page pageid="10" ns="10" title="Template:Log List Single" />
    </pages>
  </query>
</api>