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="5643" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1617" ns="10" title="Plantilla:Infomod Abrir" contentmodel="wikitext" pagelanguage="es" touched="2008-02-27T20:23:01Z" lastrevid="7620" counter="380" length="447" />
      <page pageid="1619" ns="10" title="Plantilla:Infomod Cerrar" contentmodel="wikitext" pagelanguage="es" touched="2008-02-27T20:24:29Z" lastrevid="7621" counter="358" length="160" />
      <page pageid="1630" ns="10" title="Plantilla:Copyright" contentmodel="wikitext" pagelanguage="es" touched="2021-11-07T10:23:47Z" lastrevid="15966" counter="1923" length="1036" />
      <page pageid="1818" ns="0" title="Western Design Center" contentmodel="wikitext" pagelanguage="es" touched="2017-06-03T19:36:55Z" lastrevid="14275" counter="4230" length="3509" />
      <page pageid="4936" ns="0" title="Coprocesador" contentmodel="wikitext" pagelanguage="es" touched="2021-10-27T20:06:04Z" lastrevid="6616" counter="3410" length="5088" new="" />
      <page pageid="5339" ns="10" title="Plantilla:Cita web" contentmodel="wikitext" pagelanguage="es" touched="2021-08-15T22:10:08Z" lastrevid="12604" counter="3027" length="4974" />
      <page pageid="5389" ns="10" title="Plantilla:Ficha de socket de CPU" contentmodel="wikitext" pagelanguage="es" touched="2017-05-02T20:53:13Z" lastrevid="13716" counter="1709" length="1492" />
      <page pageid="5417" ns="10" title="Plantilla:Ficha de conector" contentmodel="wikitext" pagelanguage="es" touched="2021-08-15T22:10:08Z" lastrevid="11863" counter="2230" length="10412" />
      <page pageid="5449" ns="0" title="VTech Laser 200" contentmodel="wikitext" pagelanguage="es" touched="2016-04-08T07:36:56Z" lastrevid="9865" counter="3502" length="6539" />
      <page pageid="5545" ns="0" title="Lista de ordenadores compatibles con Windows 3.1" contentmodel="wikitext" pagelanguage="es" touched="2022-07-24T21:41:50Z" lastrevid="7490" counter="11304" length="28597" />
    </pages>
  </query>
</api>