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>
    <allpages gapcontinue="Landelijke_bijeenkomst_21_mei_2019" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1169" ns="0" title="Kennisdag Inspectie Waterkeringen, 16 september 2021, Arnhem Burgers Zoo">
        <flagged stable_revid="4732" level="0" level_text="stable" />
      </page>
      <page pageid="943" ns="0" title="Kennisdag Inspectie Waterkeringen, 19 maart 2020, Burgers Zoo, Arnhem">
        <flagged stable_revid="3976" level="0" level_text="stable" />
      </page>
      <page pageid="975" ns="0" title="Kennisdag Inspectie Waterkeringen, 9 september 2020, Burgers Zoo, Arnhem">
        <flagged stable_revid="4129" level="0" level_text="stable" />
      </page>
      <page pageid="980" ns="0" title="Kennisdag Inspectie Waterkeringen - Droogte, 29 oktober 2020, Burgers Zoo(m), online">
        <flagged stable_revid="4137" level="0" level_text="stable" />
      </page>
      <page pageid="979" ns="0" title="Kennisdag Inspectie Waterkeringen - Graverijen, 1 oktober 2020, Burgers Zoo(m), online">
        <flagged stable_revid="4136" level="0" level_text="stable" />
      </page>
      <page pageid="981" ns="0" title="Kennisdag Inspectie Waterkeringen - Risicogestuurd B&amp;O, 19 november 2020, Burgers Zoo(m), online">
        <flagged stable_revid="4138" level="0" level_text="stable" />
      </page>
      <page pageid="605" ns="0" title="Kennisdag Inspectie Waterkeringen in Burgers&#039;Zoo Arnhem op 7 april 2016">
        <flagged stable_revid="2825" level="0" level_text="stable" />
      </page>
      <page pageid="783" ns="0" title="Kennisuitwisselingsdag Wiki Noodmaatregelen en WTEC met Waterschappen, Rijkswaterstaat en Defensie op 29 juni 2017">
        <flagged stable_revid="3440" level="0" level_text="stable" />
      </page>
      <page pageid="237" ns="0" title="Kruiend ijs">
        <flagged stable_revid="1148" level="0" level_text="stable" />
      </page>
      <page pageid="902" ns="0" title="Landelijke Wiki Noodmaatregelen bijeenkomst op 8 november 2018 in Driebergen">
        <flagged stable_revid="3869" level="0" level_text="stable" />
      </page>
    </pages>
  </query>
</api>