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>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20140131125949" timestamp="2014-01-31T12:59:49Z" ns="0" title="Musterseite" />
        <page value="20140415115746" timestamp="2014-04-15T11:57:46Z" ns="0" title="ARCHIUM SERVICE SCRIPTS" />
        <page value="20170209215717" timestamp="2017-02-09T21:57:17Z" ns="0" title="Testseite" />
        <page value="20180219210856" timestamp="2018-02-19T21:08:56Z" ns="0" title="Intern:Aktuelle Ereignisse Template" />
        <page value="20180219212825" timestamp="2018-02-19T21:28:25Z" ns="0" title="Was war im Jahr 2014 aktuell?" />
        <page value="20180219214751" timestamp="2018-02-19T21:47:51Z" ns="0" title="Was war im Jahr 2015 aktuell?" />
        <page value="20180219215458" timestamp="2018-02-19T21:54:58Z" ns="0" title="Was war im Jahr 2016 aktuell?" />
        <page value="20180219222306" timestamp="2018-02-19T22:23:06Z" ns="0" title="Was war im Jahr 2017 aktuell?" />
        <page value="20190110203506" timestamp="2019-01-10T20:35:06Z" ns="0" title="Was war im Jahr 2018 aktuell?" />
        <page value="20191227170913" timestamp="2019-12-27T17:09:13Z" ns="0" title="Was war im Jahr 2019 aktuell?" />
      </results>
    </querypage>
  </query>
</api>