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>
    <alltransclusions gatcontinue="DIONISIU" />
  </query-continue>
  <query>
    <pages>
      <page pageid="64" ns="10" title="Format:CARACALU" />
      <page pageid="65" ns="10" title="Format:CARACALU BIN" />
      <page pageid="5" ns="10" title="Format:CAREIA" />
      <page pageid="6" ns="10" title="Format:CAREIA BIN" />
      <page pageid="82" ns="10" title="Format:COSTAMONITU" />
      <page pageid="83" ns="10" title="Format:COSTAMONITU BIN" />
      <page pageid="54" ns="10" title="Format:CUTLUMUS" />
      <page pageid="55" ns="10" title="Format:CUTLUMUS BIN" />
      <page pageid="101" ns="10" title="Format:Chilia Inaltarea Domnului - Schitul romanesc Lacu din Muntele Athos" />
      <page pageid="102" ns="10" title="Format:Chilia Inaltarea Domnului - Schitul romanesc Lacu din Muntele Athos BIN" />
    </pages>
  </query>
</api>