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 alcontinue="Balagan_Troupe" />
  </query-continue>
  <query>
    <alllinks>
      <l ns="0" title="BAC Blumberg Video (1977)" />
      <l ns="0" title="BAC Company Pyramids Video 2002" />
      <l ns="0" title="Babaeva &amp; Kostylev" />
      <l ns="0" title="Babaeva and Kostylev" />
      <l ns="0" title="Babaeva and Kostylev Video (c2005)" />
      <l ns="0" title="Babs and Jim Zola" />
      <l ns="0" title="Back Street Flyers" />
      <l ns="0" title="Bagdasarov Dynasty" />
      <l ns="0" title="Bagdasarov Dynsty" />
      <l ns="0" title="Bagdasarov Video (2007)" />
    </alllinks>
  </query>
</api>