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>
    <allimages gaicontinue="2009_region3_map.JPG" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1137" ns="6" title="File:180ft-intrusion.png" />
      <page pageid="1326" ns="6" title="File:1915troutstocking.jpg" />
      <page pageid="1328" ns="6" title="File:1928wardenbadge.jpg" />
      <page pageid="1139" ns="6" title="File:1944to2013-intrusion.jpg" />
      <page pageid="1329" ns="6" title="File:1958marinewardens.jpg" />
      <page pageid="1304" ns="6" title="File:1998 salinas flood.jpg" />
      <page pageid="528" ns="6" title="File:2002 - TMDL for Nutrients San Diego Creek and Newport Bay.pdf" />
      <page pageid="522" ns="6" title="File:2003 - Santa Clara River Nitrogen TMDL.pdf" />
      <page pageid="78" ns="6" title="File:2008 Burn Severity.pdf" />
      <page pageid="77" ns="6" title="File:2008 Burn Severity.png" />
    </pages>
  </query>
</api>