The Perl Toolchain Summit needs more sponsors. If your company depends on Perl, please support this very important event.
# variable interpolation test
me=blah
pr=$me/blubber
<vars>
  base = /usr
  uid  = 501
</vars>

base = /opt
<etc>
  base = /usr        # set $base to a new value in this scope
  log  = ${base}/log/logfile  # use braces
  <users>
    home = $base/home/max # $base should be /usr, not /opt !
  </users>
</etc>

# block(name) test
tag  = dir
mono = teri
<$tag>
  bl = 1
</$tag>
<$tag mono>
  bl = 2
</$tag>
<text $mono>
  bl = 3
</text>
<$tag $mono>
  bl = 3
</$tag>