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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="Class_of_1964_50th_Reunion" />
  </query-continue>
  <query>
    <alllinks>
      <l ns="0" title="Bobby Brooks" />
      <l ns="0" title="Building plans; blueprints" />
      <l ns="0" title="Building plans; blueprints of the renovation" />
      <l ns="0" title="Christ Christoff" />
      <l ns="0" title="Claire Malis Callaway" />
      <l ns="0" title="Class of 1932" />
      <l ns="0" title="Class of 1932 Reunion" />
      <l ns="0" title="Class of 1932 and the Lew Wallace Study, Crawfordsville, IN" />
      <l ns="0" title="Class of 1933 50th Reunion" />
      <l ns="0" title="Class of 1933 Handbook" />
    </alllinks>
  </query>
</api>