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>
    <alllinks galcontinue="Biofysikk|1375" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Forside" />
      <page pageid="1367" ns="0" title="TFY4195 Optikk" />
      <page pageid="1371" ns="0" title="TFY4190 Instrumentering" />
      <page pageid="1374" ns="0" title="Teknisk fysikk" />
      <page pageid="1452" ns="0" title="TMA4190 Mangfoldigheter" />
      <page pageid="1471" ns="0" title="TFY4260 Cellebiologi og cellulær biofysikk" />
      <page pageid="1477" ns="0" title="Jon Andreas Støvneng" />
      <page pageid="1488" ns="0" title="TTK4105 Reguleringsteknikk" />
      <page pageid="1595" ns="0" title="MA3201 Ringer og moduler" />
    </pages>
  </query>
</api>