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>
    <links plcontinue="1|0|Nebulosity" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <links>
          <pl ns="0" title="Align and Combine" />
          <pl ns="0" title="Create 3-colour images" />
          <pl ns="0" title="Digital development" />
          <pl ns="0" title="Downloading Data from iTelescope" />
          <pl ns="0" title="FAQ" />
          <pl ns="0" title="FITS" />
          <pl ns="0" title="Get Started with iTelescope" />
          <pl ns="0" title="How to Figure Out Which Objects are Visible to Which Telescopes" />
          <pl ns="0" title="How to Take a One-Click Image using iTelescope" />
          <pl ns="0" title="How to Take a Three-Colour Image using iTelescope" />
        </links>
      </page>
    </pages>
  </query>
</api>