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>
    <pageswithprop pwpcontinue="1128" />
  </query-continue>
  <query>
    <pageswithprop>
      <page pageid="42" ns="0" title="Заглавная страница/ru" value="Заглавная страница" />
      <page pageid="83" ns="0" title="Заглавная страница/en" value="Main Page" />
      <page pageid="123" ns="0" title="Bongo Config/ru" value="Bongo Config" />
      <page pageid="130" ns="0" title="Bongo Config/en" value="i3 Config" />
      <page pageid="279" ns="0" title="Bongo App/ru" value="Bongo App" />
      <page pageid="285" ns="0" title="Bongo App/en" value="i3 liteApp" />
      <page pageid="351" ns="0" title="For Developers/ru" value="For Developers" />
      <page pageid="357" ns="0" title="For Developers/en" value="For Developers" />
      <page pageid="1006" ns="10" title="Шаблон:API Function/ru" value="Шаблон:API Function" />
      <page pageid="1091" ns="10" title="Шаблон:API Function/en" value="Шаблон:API Function" />
    </pageswithprop>
  </query>
</api>