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>
    <allpages apcontinue="CERES_Wiki_Launched" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="2546" ns="0" title="Bachelor Thesis (15 credits)" />
      <p pageid="2623" ns="0" title="Basic" />
      <p pageid="2686" ns="0" title="Bengt Johansson" />
      <p pageid="2744" ns="0" title="Bertil Svensson" />
      <p pageid="2604" ns="0" title="Bjorn Astrand" />
      <p pageid="4600" ns="0" title="Björn Nilsson" />
      <p pageid="4126" ns="0" title="Booking system for charging stations for electric cars." />
      <p pageid="4098" ns="0" title="Bridging the Gap between Acumen and Modelica" />
      <p pageid="2669" ns="0" title="Building a visual Truck model in CANoe" />
      <p pageid="2564" ns="0" title="CERES" />
    </allpages>
  </query>
</api>