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HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <allpages>
      <p pageid="439" ns="0" title="Bottle" />
      <p pageid="448" ns="0" title="Main Page" />
      <p pageid="447" ns="0" title="Main Page (en)" />
      <p pageid="1" ns="0" title="Main Page (ja)" />
      <p pageid="450" ns="0" title="Products (ja)" />
      <p pageid="453" ns="0" title="SMWCon 2011 Spring - Conference Day 1 (ja)" />
      <p pageid="452" ns="0" title="SMWCon 2011 Spring - Conference Day 2 (ja)" />
      <p pageid="451" ns="0" title="SMWCon 2011 Spring - Conference day 2 (ja)" />
      <p pageid="449" ns="0" title="Support products (ja)" />
      <p pageid="446" ns="0" title="Test" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Test/1" />
  </query-continue>
</api>