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>
    <allredirects arcontinue="STM32F103_Microcontroller|266" />
  </query-continue>
  <query>
    <allredirects>
      <r fromid="245" ns="0" title="BEAR3 compression" />
      <r fromid="246" ns="0" title="BEAR4 compression" />
      <r fromid="204" ns="0" title="Different implementations of a Collatz iterator and their performance" />
      <r fromid="205" ns="0" title="Different implementations of a simple Collatz iterator and their performance" />
      <r fromid="200" ns="0" title="Extremely simple pulse width modulation regulator" />
      <r fromid="189" ns="0" title="Instruction set: CIL" />
      <r fromid="262" ns="0" title="Locally optimal optimisation of code fragments" />
      <r fromid="208" ns="0" title="Multiplication" />
      <r fromid="173" ns="0" title="PIC: Multiplication" />
      <r fromid="323" ns="0" title="Raspberry Pi 3" />
    </allredirects>
  </query>
</api>