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>
    <allpages>
      <p pageid="1396" ns="0" title="Balance Сheck" />
      <p pageid="2078" ns="0" title="Corteos" />
      <p pageid="1163" ns="0" title="Dev:test" />
      <p pageid="1430" ns="0" title="Fee and Commission Calculator" />
      <p pageid="1127" ns="0" title="IBE/Договоры" />
      <p pageid="1121" ns="0" title="IBE/Менеджеры" />
      <p pageid="1125" ns="0" title="IBE/Моя точка продаж" />
      <p pageid="1122" ns="0" title="IBE/Настройки бронирования авиабилетов" />
      <p pageid="1132" ns="0" title="IBE/Настройки вида сайта" />
      <p pageid="1128" ns="0" title="IBE/Настройки оповещений" />
    </allpages>
  </query>
  <query-continue>
    <allpages apcontinue="IBE/Настройки_поиска_авиаперелетов" />
  </query-continue>
</api>