$callback{'EntryAggregator'} = sub { $node->setNodeValue( $_[0] ) };
$callback{'Condition'} = sub {
my ($key, $op, $value) = @_;
$callback{'EntryAggregator'} = sub { $node->setNodeValue( $_[0] ) };
$callback{'Condition'} = sub {
my ($key, $op, $value) = @_;