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"?>
<api>
  <query-continue>
    <allpages apcontinue="Bluetooth" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="6528" ns="0" title="BOX" />
      <p pageid="6207" ns="0" title="Backstrap loom" />
      <p pageid="5159" ns="0" title="Bassabox" />
      <p pageid="1270" ns="0" title="Belgium" />
      <p pageid="2309" ns="0" title="Best Practices for Fab Lab Drupal Websites" />
      <p pageid="2160" ns="0" title="Best Practices for Fab Lab Websites" />
      <p pageid="1322" ns="0" title="Biological resources" />
      <p pageid="664" ns="0" title="Blender" />
      <p pageid="5310" ns="0" title="Blender how to set up measurement units" />
      <p pageid="851" ns="0" title="Blender kennsluefni" />
    </allpages>
  </query>
</api>