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 ns="0" title="API" missing="" />
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="Admin" timestamp="2013-10-28T14:15:04Z" comment="" xml:space="preserve">=What is this wiki?=

Welcome to the Eleccelerator Wiki. This wiki is used by Frank as a notebook. The information here is different from the blog because the information on the wiki can change very quickly, where as a blog post are not typically edited after they are posted.

=What will you find on this wiki?=

Mostly notes on things like reverse engineering devices, collections of resources, project preplanning, and other topics that are subject to rapid change.

=To see all the wiki pages, click here: [[Special:AllPages|List of All Pages]]=</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>