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="CMAS_Dive_Organization" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="9821" ns="0" title="Barracuda Reef Zakynthos Ionian Islands" />
      <p pageid="11125" ns="0" title="Become a PADI Pro" />
      <p pageid="9829" ns="0" title="Big Cave Amorgos Cyclades" />
      <p pageid="9820" ns="0" title="Big Moray Reef Corfu Ionian Islands" />
      <p pageid="9987" ns="0" title="Blue Adventures Diving Chania Crete" />
      <p pageid="9629" ns="0" title="Blue Fin Divers Naxos Cyclades" />
      <p pageid="9628" ns="0" title="Blue Paradise Corfu Ionian Islands" />
      <p pageid="9627" ns="0" title="Blutopia Marine Park Rhodes Dodecanese" />
      <p pageid="10517" ns="0" title="Bootstrap:Footer" />
      <p pageid="10518" ns="0" title="Bootstrap:Subnav" />
    </allpages>
  </query>
</api>