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="Calculator|374" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="43" ns="4" title="LibreCAD wiki:Community portal" />
      <page pageid="224" ns="0" title="LibreCAD Quick Start Guide/LibreCAD Screen" />
      <page pageid="374" ns="0" title="RU:Заглавная страница" />
      <page pageid="535" ns="0" title="Part Libraries" />
      <page pageid="640" ns="0" title="What is CAD" />
      <page pageid="651" ns="0" title="RU:Библиотеки элементов" />
      <page pageid="683" ns="0" title="LibreCAD Installation from Source" />
      <page pageid="766" ns="0" title="User Interface" />
    </pages>
  </query>
</api>