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>
    <allpages apcontinue="Sequence_1008(si_130)" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="1" ns="0" title="Main Page" />
      <p pageid="82742" ns="0" title="Sequence" />
      <p pageid="95200" ns="0" title="Sequence 1000(DJ-1 , DJ1)" />
      <p pageid="95519" ns="0" title="Sequence 1001(DJ-Mu1 , DJMu1)" />
      <p pageid="95323" ns="0" title="Sequence 1002(DJ-M2 , DJM2)" />
      <p pageid="95395" ns="0" title="Sequence 1003(si 125)" />
      <p pageid="95263" ns="0" title="Sequence 1004(si 126)" />
      <p pageid="95136" ns="0" title="Sequence 1005(si 127)" />
      <p pageid="95674" ns="0" title="Sequence 1006(si 128)" />
      <p pageid="95580" ns="0" title="Sequence 1007(si 129)" />
    </allpages>
  </query>
</api>