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>
    <allredirects garcontinue="TDT4110_Informasjonsteknologi_grunnkurs" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="FY3402 Subatomær Fysikk" missing="" />
      <page pageid="1431" ns="0" title="EXPH0001 Filosofi og vitenskapsteori" />
      <page pageid="1" ns="0" title="Forside" />
      <page pageid="1438" ns="0" title="Griffiths: Introduction to Electrodynamics" />
      <page pageid="2303" ns="0" title="Hovedside/Fremhevet artikkel" />
      <page pageid="1419" ns="0" title="Owren: Numerisk løsning av partielle differensialligninger med differensemetoder" />
      <page pageid="1524" ns="0" title="PWN1337 Foo bar" />
      <page pageid="1496" ns="0" title="RWTH Aachen" />
      <page pageid="1424" ns="0" title="TDT4100 Objektorientert programmering" />
      <page pageid="1439" ns="0" title="TDT4105 Informasjonsteknologi grunnkurs" />
    </pages>
  </query>
</api>