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>
    <links plcontinue="1|0|Nouveau_Cirque_(Paris)/fr" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <links>
          <pl ns="0" title="BAC Blumberg Video (1977)" />
          <pl ns="0" title="Big Apple Circus" />
          <pl ns="0" title="Circopedia Books" />
          <pl ns="0" title="Cirque Medrano (Paris)/fr" />
          <pl ns="0" title="Dolly Jacobs Interview Video (2018)" />
          <pl ns="0" title="Durov Documentary Video (c.2000)" />
          <pl ns="0" title="Elsane" />
          <pl ns="0" title="Eradze Video (2015)" />
          <pl ns="0" title="John Chipperfield Video (1974)" />
          <pl ns="0" title="Mary Chipperfield Video (1974)" />
        </links>
      </page>
    </pages>
  </query>
</api>