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>
    <allredirects garcontinue="City_Guide_Part_7_-_Setting_up_Directories_&amp;_Categories" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Can I change the size of existing listing thumbnails" missing="" />
      <page pageid="40" ns="0" title="Can I customize the code to extend the functionality of JReviews" />
      <page pageid="37" ns="0" title="Can I install JReviews in a development domain" />
      <page pageid="1401" ns="0" title="Can I use one license in domains with different domain suffixes (TLDs)" />
      <page pageid="39" ns="0" title="Can I use one license key on sites with different domain suffixes (TLDs)" />
      <page pageid="52" ns="0" title="Category Layout Manager" />
      <page pageid="315" ns="0" title="Category Plans Page" />
      <page pageid="638" ns="0" title="City Guide Part 1 - Installing Joomla 1.7" />
      <page pageid="639" ns="0" title="City Guide Part 2 - Installing iReview template for Joomla" />
      <page pageid="640" ns="0" title="City Guide Part 3 - Installing JReviews" />
    </pages>
  </query>
</api>