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>
    <pageswithprop gpwpcontinue="49" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" contentmodel="wikitext" pagelanguage="en" touched="2019-07-13T23:36:40Z" lastrevid="223" counter="118755" length="1922" />
      <page pageid="8" ns="0" title="Ideas Future" contentmodel="wikitext" pagelanguage="en" touched="2016-06-09T08:51:11Z" lastrevid="19" counter="1012" length="2877" new="" />
      <page pageid="12" ns="0" title="Electric and Live Steam Power" contentmodel="wikitext" pagelanguage="en" touched="2017-03-27T19:47:49Z" lastrevid="140" counter="20844" length="4906" />
      <page pageid="18" ns="0" title="Kits and Scratch Built Structures" contentmodel="wikitext" pagelanguage="en" touched="2017-04-14T08:40:49Z" lastrevid="222" counter="24439" length="6568" />
      <page pageid="23" ns="0" title="Railroad Gardening with Miniature Plants" contentmodel="wikitext" pagelanguage="en" touched="2017-04-06T19:53:44Z" lastrevid="172" counter="4524" length="1001" />
      <page pageid="41" ns="0" title="Remote Control for Garden Trains" contentmodel="wikitext" pagelanguage="en" touched="2016-06-09T08:46:47Z" lastrevid="127" counter="6235" length="3312" />
      <page pageid="43" ns="0" title="Garden Railway Photography" contentmodel="wikitext" pagelanguage="en" touched="2017-04-10T20:36:10Z" lastrevid="193" counter="11123" length="7920" />
      <page pageid="45" ns="0" title="Part One: Soil and Water" contentmodel="wikitext" pagelanguage="en" touched="2017-04-06T19:55:49Z" lastrevid="176" counter="6580" length="7277" />
      <page pageid="47" ns="0" title="Part Two: Climates and Micro-Climates" contentmodel="wikitext" pagelanguage="en" touched="2017-04-06T19:55:34Z" lastrevid="175" counter="4358" length="9947" />
      <page pageid="48" ns="0" title="Part Three: Plant Diseases and Pests" contentmodel="wikitext" pagelanguage="en" touched="2017-04-06T19:56:15Z" lastrevid="177" counter="4945" length="4698" />
    </pages>
  </query>
</api>