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="BestPractices/Coding_Guidelines|1663" />
  </query-continue>
  <query>
    <allredirects>
      <r ns="0" title="BGP-LS/PCEP:Hydrogen Release Plan" />
      <r ns="0" title="BGP/PCEP protocol library:Main" />
      <r ns="0" title="BGP LS PCEP:Beryllium How-To&#039;s/Tutorials" />
      <r ns="0" title="BGP LS PCEP:Hydrogen Release Notes" />
      <r ns="0" title="BGP LS PCEP:Hydrogen Release Notes" />
      <r ns="0" title="BGP LS PCEP:Main" />
      <r ns="0" title="BGP LS PCEP:Restconf and Java Binding API" />
      <r ns="0" title="BGP LS PCEP:Stress Testing BGP With A Capture of the Internet Feed" />
      <r ns="0" title="BGP LS PCEP:TCP MD5 Guide" />
      <r ns="0" title="BestPractices/Coding Guidelines" />
    </allredirects>
  </query>
</api>