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>
    <usercontribs>
      <item userid="0" user="YurikBot" pageid="913" revid="2831" parentid="2830" ns="0" title="Droit public" timestamp="2006-04-15T23:28:29Z" minor="" comment="robot  Ajoute: [[tr:Kamu hukuku]]" size="3323" />
      <item userid="0" user="YurikBot" pageid="913" revid="2828" parentid="2827" ns="0" title="Droit public" timestamp="2006-03-25T01:23:47Z" minor="" comment="robot  Ajoute: [[sk:Verejné právo]]" size="3266" />
      <item userid="0" user="YurikBot" pageid="914" revid="2956" parentid="2955" ns="0" title="Droit civil" timestamp="2006-03-25T01:09:38Z" minor="" comment="robot  Ajoute: [[sv:Civilrätt]]" size="1123" />
    </usercontribs>
  </query>
</api>