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"?>
    <contributors pccontinue="206993|4877" />
      <n from="Main_Page" to="Main Page" />
      <page pageid="206993" ns="0" title="Main Page">
          <user userid="2" name="Rob Linden" />
          <user userid="3" name="Phoenix Linden" />
          <user userid="4" name="Dan Linden" />
          <user userid="11" name="Pathfinder Linden" />
          <user userid="24" name="Jose Linden" />
          <user userid="57" name="SignpostMarv Martin" />
          <user userid="165" name="Alison Wheels" />
          <user userid="312" name="Torley Linden" />
          <user userid="427" name="Dimentox Travanti" />
          <user userid="463" name="Ash Winx" />