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="Exchange_Powershell_Administration_Commands" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="27" ns="0" title="Bacula 5.2.13 and PostgreSQL 9.3" />
      <p pageid="2" ns="0" title="Bare Metal Recovery of Linux System Via Bacula" />
      <p pageid="32" ns="0" title="Blocking Access to URL Entire Networks with pfSense" />
      <p pageid="7" ns="0" title="Breaking Into and Resetting an Equallogic" />
      <p pageid="63" ns="0" title="Clearing CBS Logs" />
      <p pageid="8" ns="0" title="Creating And Using SSH Public Keys" />
      <p pageid="60" ns="0" title="Dell OMSA Non-Certified Drive Flag" />
      <p pageid="35" ns="0" title="ESXi Command Line Tools" />
      <p pageid="44" ns="0" title="ESXi Powershell Commandlets" />
      <p pageid="49" ns="0" title="ESXi Verify Jumbo Frames Connectivity" />
    </allpages>
  </query>
</api>