# assume we have a string if we receive only one argument
	if ( @_ == 1){
		# STRING PART ...
	}
	elsif ( $WARNINGS == 1 and @_ == 0 ){
		carp "Empty list passed in! We assume all element will be processed.";
	}
	# otherwise we received a list
	else{
		# NON EMPTY LIST PART ...
	}