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>
    <pages>
      <page pageid="310" ns="0" title="Main Page">
        <revisions>
          <rev user="Admin" timestamp="2010-01-21T01:30:21Z" comment="New page: ==Under Construction!== Welcome to the wiki! Please mind the dust—We&#039;re basing our wiki structure off of the old SCC RP, so there are still traces of it here and there that need to be ch..." />
          <rev user="Admin" timestamp="2010-01-21T01:31:33Z" comment="" />
          <rev user="Admin" timestamp="2010-01-21T01:31:43Z" comment="" />
          <rev user="Admin" timestamp="2010-01-21T01:32:01Z" comment="" />
          <rev user="Admin" timestamp="2010-01-21T01:33:56Z" comment="" />
        </revisions>
      </page>
    </pages>
  </query>
  <query-continue>
    <revisions rvcontinue="1327" />
  </query-continue>
</api>