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>
    <allpages apcontinue="Bactris_ana-juliae_Links" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="5518" ns="0" title="Bactris Links" />
      <p pageid="5519" ns="0" title="Bactris acanthocarpa" />
      <p pageid="5520" ns="0" title="Bactris acanthocarpa Links" />
      <p pageid="5551" ns="0" title="Bactris acanthocarpa var. exscapa" />
      <p pageid="5552" ns="0" title="Bactris acanthocarpa var. exscapa Links" />
      <p pageid="5553" ns="0" title="Bactris acanthocarpa var. trailiana" />
      <p pageid="5554" ns="0" title="Bactris acanthocarpa var. trailiana Links" />
      <p pageid="5555" ns="0" title="Bactris acanthocarpoides" />
      <p pageid="5556" ns="0" title="Bactris acanthocarpoides Links" />
      <p pageid="5559" ns="0" title="Bactris ana-juliae" />
    </allpages>
  </query>
</api>