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="Baccello_di_Pii_selvatico" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="106" ns="0" title="BTS" />
      <p pageid="66" ns="0" title="BTS Basilisco" />
      <p pageid="68" ns="0" title="BTS Cavaliere gigante" />
      <p pageid="67" ns="0" title="BTS Chrysos" />
      <p pageid="65" ns="0" title="BTS Treekun" />
      <p pageid="5522" ns="0" title="Babbo Natale" />
      <p pageid="3741" ns="0" title="Babbo Opossum" />
      <p pageid="5550" ns="0" title="Babbo Opossum (perla)" />
      <p pageid="18857" ns="0" title="Bacca di falesia" />
      <p pageid="14531" ns="0" title="Baccello di Fagiolo" />
    </allpages>
  </query>
</api>