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>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20141222185611" timestamp="2014-12-22T18:56:11Z" ns="0" title="Check list en cas d&#039;errors" />
        <page value="20141223105839" timestamp="2014-12-23T10:58:39Z" ns="0" title="Configuracions generals" />
        <page value="20150104074625" timestamp="2015-01-04T07:46:25Z" ns="0" title="Grups" />
        <page value="20150114054940" timestamp="2015-01-14T05:49:40Z" ns="0" title="Matèries,Mòduls i Unitats formatives" />
        <page value="20150115112833" timestamp="2015-01-15T11:28:33Z" ns="0" title="Tauler de control" />
        <page value="20150115114504" timestamp="2015-01-15T11:45:04Z" ns="0" title="Absències de professorat" />
        <page value="20150115114632" timestamp="2015-01-15T11:46:32Z" ns="0" title="Gestió de sortides" />
        <page value="20150118212202" timestamp="2015-01-18T21:22:02Z" ns="0" title="Professorat" />
        <page value="20150207092935" timestamp="2015-02-07T09:29:35Z" ns="0" title="Conductes contràries a la convivència" />
        <page value="20150207093247" timestamp="2015-02-07T09:32:47Z" ns="0" title="Assegurament del servei" />
      </results>
    </querypage>
  </query>
</api>