[Koha-devel] MARC::Record, record length and leader

[Mike Hafen]

I think there is not a more forgiving parser.  The ISO2709 spec breaks when
a record reaches 100000 octets.  I don't see any way around that in the
parser.  The best solution I can come up with, if you want to hold to the
spec, is to create a seperate ISO2709 blob with a logical link to the first
when a record reaches 100000 octets.  I don't know if that could be
implemented in the parser though.  I think that any other way will result
in either a broken record or a broken parser.

On Wed, May 9, 2012 at 1:23 AM, Julian Maurice
<julian.maurice at biblibre.com>wrote:

> Le 07/05/2012 17:30, Galen Charlton a écrit :
>
>> Hi,
>>
>
> Hi!
>
>
>
>> On May 4, 2012, at 10:38 AM, Julian Maurice wrote:
>>
>>> In order to close this discussion, I created a ticket on rt.cpan.org (
>>> https://rt.cpan.org/Public/**Bug/Display.html?id=76990<https://rt.cpan.org/Public/Bug/Display.html?id=76990>)
>>> and attached a patch to force record length to not be greater than 99999 in
>>> the leader.
>>>
>>
>> This would have the effect of having MARC::Record output invalid records
>> that we *know* are invalid.  There's no way around it -- an ISO2709 blob
>> can be no longer than 99999 octets, and a strict parser (a couple of which
>> do exist in the wild) would drop records where the Leader/05 does not match
>> the length of the record as determined by the location of the record
>> terminator character.
>>
>
> Actually, MARC::Record will always output invalid records if they're
> longer than 99999 bytes. But with the patch, at least the leader is
> well-formed (24 chars long).
>
>
>
>> I'm much more inclined to accept a patch to MARC::Record that introduces
>> a more forgiving input parsing mode.
>>
>>
> What do you mean by "a more **forgiving** input parsing mode" ?
>
>
> --
> Julian Maurice <julian.maurice at biblibre.com>
> BibLibre
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