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>
    <alltransclusions gatcontinue="Ebaluazioa|1646" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1472" ns="0" title="Ebaluazioa: Sarrera" />
      <page pageid="1473" ns="0" title="Ebaluazioaren definizio zabal baterantz" />
      <page pageid="1476" ns="0" title="Didaktekan erabilitako bibliografia" />
      <page pageid="1477" ns="0" title="Ebaluazio-paradigmak" />
      <page pageid="1478" ns="0" title="Ebaluazio kuantitatiboa" />
      <page pageid="1479" ns="0" title="Ebaluazio kualitatiboa" />
      <page pageid="1634" ns="0" title="Ebaluazioa" />
      <page pageid="1645" ns="0" title="Ebaluazio-motak" />
      <page pageid="1705" ns="0" title="Testuaren linguistika bibliografia" />
      <page pageid="1744" ns="0" title="Autonomia ikas-estiloak bibliografia" />
    </pages>
  </query>
</api>