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 apcontinue="DVB-T_2_Mhz_Ham-Mode_instellingen_op_PI6ZDM" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="55" ns="0" title="Dag voor de Radio Amateur (DvdRA) 2014" />
      <p pageid="9" ns="0" title="Deeltal instellingen" />
      <p pageid="111" ns="0" title="Digilite-Raspberry Pi 2x2" />
      <p pageid="5" ns="0" title="Digilite-ZL" />
      <p pageid="47" ns="0" title="Digitale ingang" />
      <p pageid="37" ns="0" title="DVB-S" />
      <p pageid="20" ns="0" title="DVB-S2" />
      <p pageid="279" ns="0" title="DVB-S 2KS DATV-Express instellingen op PI6HLM" />
      <p pageid="110" ns="0" title="DVB-S USB ontvanger Hauppage DEC3000" />
      <p pageid="138" ns="0" title="DVB-S zender met 1x Raspberry PI3 en RPIDATV" />
    </allpages>
  </query>
</api>