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>
    <alllinks galcontinue="Fotovoltaika" />
  </query-continue>
  <query>
    <pages>
      <page pageid="93" ns="0" title="Bioplynové stanice" />
      <page pageid="50" ns="0" title="Bodová výnosnost" />
      <page pageid="104" ns="0" title="CZT" />
      <page pageid="149" ns="0" title="Cp - maximální přípustné hodnoty faktoru ochranného vlivu vegetace" />
      <page pageid="118" ns="0" title="Dehumifikace" />
      <page pageid="110" ns="0" title="Drůbež" />
      <page pageid="114" ns="0" title="Elektřina" />
      <page pageid="121" ns="0" title="Encyklopedie RESTEP" />
      <page pageid="39" ns="0" title="Fototermika" />
      <page pageid="98" ns="0" title="Čistírny odpadních vod" />
    </pages>
  </query>
</api>