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>
    <alllinks galcontinue="Metapattern_Codes" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="CONSTANT FLUFF" missing="" />
      <page ns="0" title="FUNCTION FLUFF" missing="" />
      <page ns="0" title="INTRO" missing="" />
      <page ns="0" title="LICENSE" missing="" />
      <page ns="0" title="LIGHTWEIGHT VISUALS" missing="" />
      <page ns="0" title="MAIN" missing="" />
      <page ns="0" title="MakeTemplate.jsx" missing="" />
      <page pageid="7" ns="0" title="Communicating Of Metapatterns" />
      <page pageid="13" ns="0" title="Encrypted Windows Files Have Green Filenames" />
      <page pageid="10" ns="0" title="LINE END CRLF" />
    </pages>
  </query>
</api>