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>
    <prefixsearch>
      <ps ns="0" title="Meaning And Advertising - The Hurricane" pageid="10867" />
      <ps ns="0" title="Meaning And Marketing - The Hurricane" pageid="10853" />
      <ps ns="0" title="Meaning In The Star Of David" pageid="498103" />
      <ps ns="0" title="Meaning Of Slot In Longman Dictionary Of Contemporary English" pageid="147465" />
      <ps ns="0" title="Meaning Of Your Star Of David" pageid="497875" />
      <ps ns="0" title="Meaningful Names For Your Babies" pageid="172957" />
    </prefixsearch>
  </query>
</api>