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-continue>
    <links gplcontinue="1|0|Intro_System" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2" ns="0" title="Account System" contentmodel="wikitext" pagelanguage="en" touched="2014-10-06T09:45:40Z" lastrevid="287" counter="10641" length="2079" />
      <page pageid="3" ns="0" title="Building System" contentmodel="wikitext" pagelanguage="en" touched="2019-12-08T22:07:20Z" lastrevid="3386" counter="25291" length="1867" />
      <page pageid="4" ns="0" title="Chargen System" contentmodel="wikitext" pagelanguage="en" touched="2016-05-15T06:00:47Z" lastrevid="2754" counter="21349" length="1199" />
      <page pageid="55" ns="0" title="Cook" contentmodel="wikitext" pagelanguage="en" touched="2019-12-17T18:18:22Z" lastrevid="3393" counter="29810" length="1478" />
      <page pageid="14" ns="0" title="Education Buildings" contentmodel="wikitext" pagelanguage="en" touched="2019-12-23T03:55:50Z" lastrevid="3406" counter="94913" length="3629" />
      <page pageid="32" ns="0" title="Entertainment Buildings" contentmodel="wikitext" pagelanguage="en" touched="2019-11-12T19:37:45Z" lastrevid="3256" counter="25540" length="797" />
      <page pageid="56" ns="0" title="Farmer" contentmodel="wikitext" pagelanguage="en" touched="2019-12-25T06:42:51Z" lastrevid="3426" counter="54717" length="1737" />
      <page pageid="5" ns="0" title="Feature List" contentmodel="wikitext" pagelanguage="en" touched="2020-02-15T19:51:24Z" lastrevid="3479" counter="120876" length="3354" />
      <page pageid="54" ns="0" title="Hunter" contentmodel="wikitext" pagelanguage="en" touched="2017-12-23T19:07:46Z" lastrevid="2913" counter="19204" length="1710" />
      <page pageid="28" ns="0" title="Industrial Buildings" contentmodel="wikitext" pagelanguage="en" touched="2019-11-08T19:39:17Z" lastrevid="3208" counter="120252" length="3921" />
    </pages>
  </query>
</api>