Hello,
MARC::Record::leader() doesn't have the same function as update_leader().
leader() seems to be a setter/getter method, but to set you need to know
what you're setting to beforehand.
update_leader() used to be really handy when you read in a MARC::Record from
somewhere, changed or added a few fields. Then to update the leader to
reflect those changes you only had to call $record->update_leader() and not
have to do any tedious and possibly incorrect calculations yourself to set
the leader using $record->leader($text).
I'm currently using a colleague's calculations (from the UKMARC manual):
my $reclen = length($marc->as_usmarc())+24;
my $baseaddr = 24+(scalar($marc->fields())*12)+1;
$marc->set_leader_lengths(sprintf("%05d", $reclen),
sprintf("%05d", $baseaddr));
but thought that update_leader() ought (and used) to do this for you (indeed
we're not 100% sure our calculations are right, but they seem to work!).
Any more clues?
Ben
On Wed, 19 November, 2003 16:42, Ed Summers wrote:
> On Wed, Nov 19, 2003 at 04:22:41PM +0000, Ben Soares wrote:
> > I see there's an update_leader() method in MARC::File::USMARC, but I
> > can't work out how you're supposed to use it. At first glance at the
> > code, it looks like update_leader() and _build_tag_directory() have
> > fallen out of MARC::Record and ended up in MARC::File::USMARC by
> > accident?
>
> See MARC::Record::leader().
>
> //Ed
--
Ben Soares tel: +44 (0)131-651 1238
EDINA, Edinburgh University Data Library fax: +44 (0)131-650 3308
Main Library Building, George Square email: [EMAIL PROTECTED]
Edinburgh EH8 9LJ, Scotland, UK www: http://edina.ac.uk/
"Hmmm, that makes no sense to me...
But then you are very small, perhaps you're right." -- Treebeard
