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"?>
    <allfileusages gafcontinue="Badidea.gif|2544" />
      <page pageid="1321" ns="0" title="MakerFaire" />
      <page pageid="1935" ns="0" title="Hardware Lab 2" />
      <page pageid="1973" ns="0" title="Software Lab 250" />
      <page pageid="2061" ns="0" title="Listening Room ChucK tutorial" />
      <page pageid="2330" ns="0" title="Software Lab NMC" />
      <page pageid="2334" ns="0" title="Making Sound Satellite" />
      <page pageid="2420" ns="0" title="Stompbox Lab 0" />
      <page pageid="3097" ns="0" title="Tower of Power" />
      <page pageid="3387" ns="0" title="MakerFaire2015" />
      <page pageid="3607" ns="0" title="HELiX" />