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Please see "format" parameter documentation at the API help for more information. 
<?xml version="1.0" encoding="utf-8"?>
<api>
  <query>
    <pages>
      <page pageid="937" ns="2" title="User:Gregory.Szorc" touched="2007-02-26T02:55:30Z" lastrevid="27883" />
      <page pageid="1301" ns="0" title="Main page" touched="2005-07-19T22:01:35Z" lastrevid="2311" redirect="" />
      <page pageid="2106" ns="0" title="Central Authentication Service" touched="2009-10-20T15:01:56Z" lastrevid="38089" />
      <page pageid="2519" ns="0" title="Network Access and Leaving the University Policy" touched="2009-01-22T05:07:05Z" lastrevid="36845" />
      <page pageid="3046" ns="0" title="PHP" touched="2009-04-29T16:17:45Z" lastrevid="37126" />
      <page pageid="3106" ns="0" title="The World's Most Powerful Learning Environment" touched="2006-03-01T04:19:25Z" lastrevid="7934" redirect="" />
      <page pageid="3272" ns="12" title="Help:Cheat sheet" touched="2006-03-22T23:40:37Z" lastrevid="8647" />
      <page pageid="3285" ns="2" title="User:Melissa.Delucchi" touched="2006-03-24T20:39:43Z" lastrevid="8692" />
      <page pageid="3922" ns="1" title="Talk:Wiki farm proposal" touched="2007-01-08T11:53:19Z" lastrevid="23964" />
      <page pageid="5160" ns="0" title="Case Wiki" touched="2006-10-31T14:55:19Z" lastrevid="17739" redirect="" />
      <page pageid="1" ns="0" title="Main Page" touched="2006-09-09T19:27:34Z" lastrevid="13211" />
    </pages>
  </query>
</api>