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 gafcontinue="BinarySemaphoreNonRecursiveLock.png|2446" />
  </query-continue>
  <query>
    <pages>
      <page pageid="188" ns="0" title="5.8051 Timer programming" />
      <page pageid="385" ns="0" title="Interfacing Seven Segment with 8051" />
      <page pageid="402" ns="0" title="Interfacing Seven Segment Displays with AVR" />
      <page pageid="435" ns="0" title="Interfacing Seven Segments with PIC16f877a" />
      <page pageid="1200" ns="0" title="Water Level Indicator" />
      <page pageid="1684" ns="0" title="Programming nRF51822 with STlink on Windows" />
      <page pageid="2407" ns="0" title="Binary Semaphore 02: Extended Priority Inversion" />
      <page pageid="2423" ns="0" title="Binary Semaphore 06: No Task Deletion Safety" />
      <page pageid="2424" ns="0" title="Binary Semaphore 05: No-Ownership" />
      <page pageid="2426" ns="0" title="Binary Semaphore 04: Non-Recursive Locks" />
    </pages>
  </query>
</api>