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"?>
    <allredirects garcontinue="Buzzers" />
      <page pageid="3316" ns="0" title="Backpack" />
      <page pageid="3334" ns="0" title="Backpack Creation" />
      <page pageid="1948" ns="0" title="Bake Sale" />
      <page pageid="3575" ns="0" title="Baltz Algorithmic Generator of Spectra" />
      <page pageid="2750" ns="0" title="Becca Kalinger" />
      <page pageid="2462" ns="0" title="Beginner&#039;s Guide to the Wiki" />
      <page pageid="3385" ns="0" title="Bell HS" />
      <page pageid="1484" ns="0" title="Blame List" />
      <page pageid="1744" ns="0" title="Breaker Panel Operation Procedures" />
      <page pageid="2100" ns="0" title="Bunk Bed" />