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>
    <allfileusages afcontinue="BAOS_device_config_SetRelations.png|535" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="Файл:BAOS add channel F2 button.png" />
      <f ns="6" title="Файл:BAOS add command Relay 1.png" />
      <f ns="6" title="Файл:BAOS add command Relay 1.png" />
      <f ns="6" title="Файл:BAOS bind the command relay on off.png" />
      <f ns="6" title="Файл:BAOS connection settings.png" />
      <f ns="6" title="Файл:BAOS connection settings ext.png" />
      <f ns="6" title="Файл:BAOS creation of gateways and channels.png" />
      <f ns="6" title="Файл:BAOS device config DataPoints.png" />
      <f ns="6" title="Файл:BAOS device config General.png" />
      <f ns="6" title="Файл:BAOS device config IPConfiguration.png" />
    </allfileusages>
  </query>
</api>