+ # do nodes
+ my ($del, $add);
+ my %in;
+ if ($thing->{n}) {
+ %in = (map {my ($here, $call) = unpack("A1 A*", $_); ($call, $here)} split /:/, $thing->{n});
+ my ($tdel, $tadd) = $parent->diff_nodes(keys %in);
+ $add = $tadd;
+ $del = $tdel;
+ }
+ if ($thing->{a}) {
+ %in = (map {my ($here, $call) = unpack("A1 A*", $_); ($call, $here)} split /:/, $thing->{a});
+ my ($tdel, $tadd) = $parent->diff_nodes(keys %in);
+ push @$add, @$tadd;
+ push @$del, @$tdel;
+ }
+ if ($add) {
+ my @pc21;
+ foreach my $call (@$del) {
+ RouteDB::delete($call, $chan_call);
+ my $ref = Route::Node::get($call);
+ push @pc21, $ref->del($parent) if $ref;
+ }
+ $thing->{pc21n} = \@pc21 if @pc21;
+ }
+ if ($del) {
+ my @pc19;
+ foreach my $call (@$add) {
+ RouteDB::update($call, $chan_call);
+ my $ref = Route::Node::get($call);
+ push @pc19, $parent->add($call, 0, $in{$call}) unless $ref;
+ }
+ $thing->{pc19n} = \@pc19 if @pc19;
+ }
+
+ # now users
+ if ($thing->{u}) {
+ %in = (map {my ($here, $call) = unpack "A1 A*", $_; ($call, $here)} split /:/, $thing->{u});
+ ($del, $add) = $parent->diff_users(keys %in);