You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <tags>
      <tag name="coi-spam" displayname="coi-spam" description="" hitcount="4" />
      <tag name="Rapid reverts" displayname="Rapid reverts" description="" hitcount="0" />
      <tag name="adding email address" displayname="adding email address" description="" hitcount="0" />
      <tag name="nonsense characters" displayname="nonsense characters" description="" hitcount="0" />
      <tag name="unusual redirect" displayname="unusual redirect" description="" hitcount="0" />
      <tag name="possible link spam" displayname="possible link spam" description="" hitcount="0" />
      <tag name="blanking" displayname="blanking" description="" hitcount="0" />
    </tags>
  </query>
</api>