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>
  <warnings>
    <main xml:space="preserve">Unrecognized parameter: '*'</main>
  </warnings>
  <query-continue>
    <revisions rvcontinue="7489" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="TheTraveler" timestamp="2014-01-21T19:43:35Z" comment="Changed protection level for &quot;[[Main Page]]&quot; ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]" />
          <rev user="TheTraveler" timestamp="2014-01-21T17:41:49Z" comment="Reverted edits by [[Special:Contributions/Halina40Vasth|Halina40Vasth]] ([[User talk:Halina40Vasth|talk]]) to last revision by [[User:TheTraveler|TheTraveler]]" />
          <rev user="Halina40Vasth" timestamp="2014-01-21T11:13:27Z" comment="" />
          <rev user="TheTraveler" timestamp="2014-01-20T08:32:18Z" comment="Protected &quot;[[Main Page]]&quot; ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))" />
          <rev user="TheTraveler" timestamp="2014-01-20T08:31:10Z" comment="Reverted edits by [[Special:Contributions/Jeffry41Xesdoxz|Jeffry41Xesdoxz]] ([[User talk:Jeffry41Xesdoxz|talk]]) to last revision by [[User:CosmicLion|CosmicLion]]" />
        </revisions>
      </page>
    </pages>
  </query>
</api>