Unfamiliar calling of a subroutine

	Would someone be so kind as to explain the following, or at least point me to further reading?

$item = $main::global->{open}->{catalog}->SurfDB::split_line($main::global->{form}->{'itemid'});

	The part I'm having trouble understanding is "$main::global->{open}->{catalog}->".  What does that do to the split_line sub that's being called?  What does it do differently than just calling SurfDB::split_line($main::global->{form}->{'itemid'}) by itself?

Thanks,
Marc

• Unfamiliar calling of a subroutine by sono-io
• Re: Unfamiliar calling of a subroutine by Brock
• Re: Unfamiliar calling of a subroutine by sono-io
• Re: Unfamiliar calling of a subroutine by pangj