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="721" ns="0" title="Main Page" contentmodel="wikitext" pagelanguage="en" touched="2016-12-25T00:49:58Z" lastrevid="35445" counter="4227729" length="3730" />
      <page pageid="3574" ns="0" title="Radio Listening Software" contentmodel="wikitext" pagelanguage="en" touched="2019-07-17T23:30:26Z" lastrevid="36261" counter="43556" length="5249" />
      <page pageid="4550" ns="0" title="Technical background" contentmodel="wikitext" pagelanguage="en" touched="2017-10-08T12:47:07Z" lastrevid="35805" counter="47207" length="1412" />
      <page pageid="4551" ns="0" title="Hardware device information" contentmodel="wikitext" pagelanguage="en" touched="2018-10-24T09:01:59Z" lastrevid="36168" counter="753230" length="2132" />
      <page pageid="4552" ns="0" title="User information" contentmodel="wikitext" pagelanguage="en" touched="2016-12-25T00:47:21Z" lastrevid="35406" counter="148773" length="1164" />
      <page pageid="4553" ns="0" title="Other sources of info" contentmodel="wikitext" pagelanguage="en" touched="2016-12-25T00:48:34Z" lastrevid="35444" counter="23057" length="2049" />
      <page pageid="4559" ns="0" title="Developer section" contentmodel="wikitext" pagelanguage="en" touched="2018-03-30T07:33:33Z" lastrevid="35964" counter="44488" length="3186" />
    </pages>
  </query>
</api>