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="268" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Hauptseite" touched="2020-05-17T07:30:14Z" lastrevid="32197" counter="359779" length="706" />
      <page pageid="4" ns="0" title="Lernpfade/Zentrische Streckung" touched="2017-12-16T21:28:13Z" lastrevid="32045" counter="34262" length="578" />
      <page pageid="11" ns="0" title="Lernpfade/Flächeninhalt ebener Figuren" touched="2014-06-23T15:35:48Z" lastrevid="29040" counter="18515" length="1044" />
      <page pageid="31" ns="0" title="Lernpfade/Achsenspiegelung" touched="2014-06-23T15:35:48Z" lastrevid="29093" counter="48455" length="582" />
      <page pageid="57" ns="0" title="Lernpfade/Satz des Thales/Erarbeitung von Grundwissen für den Satz des Thales" touched="2014-06-23T15:35:48Z" lastrevid="2074" counter="41999" length="12104" />
      <page pageid="58" ns="0" title="Lernpfade/Satz des Thales/Der Satz des Thales" touched="2014-06-23T15:35:48Z" lastrevid="30959" counter="41732" length="12527" />
      <page pageid="67" ns="0" title="Lernpfade" touched="2020-05-23T05:54:19Z" lastrevid="32200" counter="173954" length="3251" />
      <page pageid="74" ns="0" title="Lernpfade/Berechenbarkeit/Praktische Grenzen der Berechenbarkeit" touched="2014-02-08T21:16:28Z" lastrevid="30578" counter="22824" length="15873" />
      <page pageid="80" ns="2" title="Benutzer:Christine Wolf" touched="2014-06-23T15:35:48Z" lastrevid="31116" counter="7109" length="842" />
      <page pageid="170" ns="0" title="Lernpfade/Satz des Thales/Übungsaufgaben zum Satz des Thales" touched="2014-06-23T15:35:48Z" lastrevid="3562" counter="91028" length="15213" />
    </pages>
  </query>
</api>