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="7927" ns="14" title="Category:Scientists and scientific concepts" contentmodel="wikitext" pagelanguage="en" touched="2014-08-26T04:24:18Z" lastrevid="33583" counter="2969" length="28" new="" />
      <page pageid="2370" ns="14" title="Category:Them Or Us (The List)" contentmodel="wikitext" pagelanguage="en" touched="2013-01-14T13:46:10Z" lastrevid="20655" counter="22056" length="574" />
      <page pageid="2367" ns="14" title="Category:We&#039;re Only In It For the Money (The List)" contentmodel="wikitext" pagelanguage="en" touched="2018-11-25T06:05:15Z" lastrevid="20725" counter="19155" length="578" />
    </pages>
  </query>
</api>