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="Blue_mystic" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Banisteriopsis" missing="" />
      <page pageid="1936" ns="0" title="Backebergia militaris" />
      <page pageid="1286" ns="0" title="Baeocystin" />
      <page pageid="2114" ns="0" title="Balansia" />
      <page pageid="1358" ns="0" title="Banisteriopsis caapi" />
      <page pageid="2227" ns="0" title="Batch" />
      <page pageid="1711" ns="0" title="Beredning av Green Dragon" />
      <page pageid="2064" ns="0" title="Betakarboliner" />
      <page pageid="2442" ns="0" title="Blandade citat" />
      <page pageid="1767" ns="0" title="Blotter" />
    </pages>
  </query>
</api>