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="Cite_news|155" />
  </query-continue>
  <query>
    <pages>
      <page pageid="153" ns="0" title="Cartridge tilting" />
      <page pageid="154" ns="0" title="Italian Fascism and German Nazism" />
      <page pageid="159" ns="0" title="Todd Akin rape and pregnancy comment controversy" />
      <page pageid="160" ns="0" title="You didn&#039;t build that" />
      <page pageid="161" ns="0" title="Inchrosil" />
      <page pageid="165" ns="0" title="Heim theory" />
      <page pageid="177" ns="0" title="La cavalcata di Giacomo il lebbroso" />
      <page pageid="180" ns="0" title="List of cancer victim hoaxes" />
    </pages>
  </query>
</api>