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="Links" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="CH391L/DynamicProgramming" missing="" />
      <page pageid="73" ns="0" title="CH391L/BLOSUM" />
      <page pageid="70" ns="0" title="CH391L/Connecting Server" />
      <page pageid="74" ns="0" title="CH391L/HiddenMarkovModel" />
      <page pageid="72" ns="0" title="CH391L/NucleotideFrequency" />
      <page pageid="71" ns="0" title="CH391L/PERL Programming" />
      <page pageid="75" ns="0" title="CH391L/UTpond" />
      <page pageid="106" ns="0" title="CH391L 2013/Connecting Server" />
      <page pageid="121" ns="0" title="ChungKwon2013 RFX2" />
      <page pageid="202" ns="0" title="Jyoung test" />
    </pages>
  </query>
</api>