Why not prettifying in a post-processing step?

I mean, if you happen to have libxml2 installed, then you have the unbeatible xmllint utility at your disposal:

rg@something:/tmp$ echo '<PrimaryServers><Server Name="New_2"/><Server
+ Name="New_1"/></PrimaryServers>' | xmllint --format -
[download]

This results in a beautiful XML layout:

<?xml version="1.0"?>
<PrimaryServers>
  <Server Name="New_2"/>
  <Server Name="New_1"/>
</PrimaryServers>
[download]

rg0now