You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
Please see "format" parameter documentation at the API help for more information. 
<?xml version="1.0" encoding="utf-8"?>
<api>
  <query>
    <namespaces>
      <ns id="-2">Media</ns>
      <ns id="-1">Special</ns>
      <ns id="0" />
      <ns id="1">Discuţie</ns>
      <ns id="2">Utilizator</ns>
      <ns id="3">Discuţie Utilizator</ns>
      <ns id="4">Rodovid RO</ns>
      <ns id="5">Discuţie Rodovid RO</ns>
      <ns id="6">Imagine</ns>
      <ns id="7">Discuţie Imagine</ns>
      <ns id="8">MediaWiki</ns>
      <ns id="9">Discuţie MediaWiki</ns>
      <ns id="10">Format</ns>
      <ns id="11">Discuţie Format</ns>
      <ns id="12">Ajutor</ns>
      <ns id="13">Discuţie Ajutor</ns>
      <ns id="14">Categorie</ns>
      <ns id="15">Discuţie Categorie</ns>
      <ns id="1000">Persoană</ns>
      <ns id="1001">Discuţie persoană</ns>
      <ns id="1002">Familie</ns>
      <ns id="1003">Discuţie familie</ns>
      <ns id="1004">Clan</ns>
      <ns id="1005">Discuţie clan</ns>
      <ns id="1006">Sursă</ns>
      <ns id="1007">Discuţie sursă</ns>
      <ns id="1008">Loc</ns>
      <ns id="1009">Discuţie loc</ns>
    </namespaces>
  </query>
</api>