['ClearCache',       'yesno',            'No'],

sub parse_yesno {
my($var, $value) = @_;
$_ = $value;
if (m/^y/i || m/^t/i || m/^1/) {
  return 1;
}
elsif (m/^n/i || m/^f/i || m/^0/) {
  return 0;
}
else {
  config_error("Use 'yes' or 'no' for the $var directive\n");
}
}