n
   <code>project.properties</code> and <code>private.properties</code>, but prefix configuration-specific
   property names with the prefix <code>configs.<i>CONFIGNAME</i>.</code> and use Ant filter chains to strip off
   the prefix when loading. This style also works well and avoids the need for extra properties files, although
   it is a bit trickier in <code>build-impl.xml</code> and makes it less obvious which configurations exist in a
   given project. (Configurations are listed in <code>project.xml<