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="Benutzer:GuentherWuchterl|119" />
  </query-continue>
  <query>
    <pages>
      <page pageid="35" ns="0" title="Lightmeter calibration before the IYA 2009" />
      <page pageid="41" ns="0" title="Calibration example Linz" />
      <page pageid="68" ns="0" title="Grossmugl Lightmeter" />
      <page pageid="76" ns="0" title="News Archive" />
      <page pageid="77" ns="0" title="Lightmeter" />
      <page pageid="94" ns="0" title="Lightrouter" />
      <page pageid="95" ns="0" title="Lichtkartierung und Lichtkataster Wien" />
      <page pageid="111" ns="0" title="Stationsseite Lebensministerium" />
      <page pageid="425" ns="0" title="Projekt Alpennacht" />
      <page pageid="445" ns="2" title="User:Nero2401" />
    </pages>
  </query>
</api>