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="Gene_NT5E" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Choanoflagellate" missing="" />
      <page ns="0" title="Gene CDC25A" missing="" />
      <page ns="0" title="Gene CDC25B" missing="" />
      <page ns="0" title="Gene CDC25C" missing="" />
      <page pageid="5" ns="0" title="CTD Phosphorylation" />
      <page pageid="114" ns="0" title="Dephosphorylation on unusual amino acids" />
      <page pageid="343" ns="0" title="Drug Targeting Phosphatases" />
      <page pageid="182" ns="0" title="Ecdysozoa" />
      <page pageid="180" ns="0" title="Eumetazoa" />
      <page pageid="136" ns="0" title="Gene ITPA" />
    </pages>
  </query>
</api>