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>
    <random>
      <page id="2973" ns="0" title="Covered entity" />
      <page id="5686" ns="0" title="Perceived efficiency impacts following electronic health record implementation: an exploratory study of an urban community health center network" />
    </random>
  </query>
</api>