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="Charakter|47" />
  </query-continue>
  <query>
    <pages>
      <page pageid="10" ns="10" title="Vorlage:Charakter" />
      <page pageid="20" ns="0" title="Viktor Leuenhold" />
      <page pageid="26" ns="0" title="Leona Leuenhold" />
      <page pageid="34" ns="0" title="Gero Fuxfell" />
      <page pageid="37" ns="0" title="Rondrian Adersin" />
      <page pageid="38" ns="0" title="Varia" />
      <page pageid="39" ns="0" title="Fiana Rodiak" />
      <page pageid="42" ns="0" title="Tristan Rodiak" />
      <page pageid="45" ns="0" title="Fianna Morgentau" />
      <page pageid="46" ns="0" title="Hagen Marnion" />
    </pages>
  </query>
</api>