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="Redistribution_and_managing_dependencies" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="27" ns="0" title="Building Source Code" />
      <p pageid="31" ns="0" title="Calling REST based Web services" />
      <p pageid="32" ns="0" title="Calling SOAP Web services" />
      <p pageid="23" ns="0" title="Configuration file" />
      <p pageid="21" ns="0" title="ETL scenario language" />
      <p pageid="19" ns="0" title="ETL scenario language specification" />
      <p pageid="25" ns="0" title="Installing and Configuring ETL Framework" />
      <p pageid="1" ns="0" title="Main Page" />
      <p pageid="26" ns="0" title="Redistribution List" />
      <p pageid="30" ns="0" title="Redistribution and Dependencies" />
    </allpages>
  </query>
</api>