%# vim:syn=mason
<%args>
	$object
	$name => undef
	$SETS => undef
</%args>
<%init>
	return undef unless ref $SETS;
	return undef unless $name;

	my %geo;
	$geo{$_} = 1 foreach $object->$name;
	while (my ($k, $v) = each(%$SETS)) {
		next unless $k =~ /^${name}_(add|delete)$/;
		next unless $v;

		if ($1 eq 'add') {
			$geo{$v} = 1;
		} elsif ($1 eq 'delete') {
			if (ref $v eq 'ARRAY') {
				delete $geo{$_} foreach @$v;
			} else {
				delete $geo{$v};
			}
		}
	}

	return [keys %geo];
</%init>