On 5/17/13 10:27 AM, Ford, Kevin wrote:
> That said, we also recognize that the publisher and physical description information in a MARC record with multiple ISBNs pertains to only one of those ISBNs.  In the case of a MARC record with two ISBNs, one for the hard back and one for a paperback, a decision will have to be made which ISBN the publication and physical description information should be associated with.


With a record with this:

020    0805028188
020    0030018889
040    |dCStRLIN
099    Mystery|aGrafton, S
100 1  Grafton, Sue
245 10 "C" is for corpse :|ba Kinsey Millhone mystery /|cSue
260    New York :|bH. Holt,|cc1986

There is nothing to say which is the "hardback" and which the 
"paperback". In fact, unless you look these up elsewhere, there isn't a 
way to know. (They are both "hardbacks" but one appears to be the more 
expensive and sturdy library binding, both issued simultaneously by the 

But that's not the point. *This* is the point:
>   This will result in some skimpy Instance resources, but that does not invalidate the principle.

What your potential users (who may choose to become non-users pretty 
quickly) are telling you is that they have chosen this method because 
they do NOT want to present two different options to users where those 
options are not meaningful to the user. All of these "skimpy Instance 
resources" will be deemed to result in poor user service. And although 
there will not be a large number of these in Library of Congress 
records, they will abound in the records of public libraries, especially 
for popular materials.

Now, you can argue that libraries have been wrong to do this all along, 
and that may be so, but what is being said is that separating out 
instances using the ISBN is not going to give libraries the results they 
want, and those front-line librarians will be the ones trying to help 
users navigate this.

Surely there are other options.


>   Further, it actually creates divisions in the data where one would want divisions.  Depending on the scenario, an enterprising cataloger - holding the paperback version - may discover a pre-existing Instance resource based on the ISBN (and its relationship to the correct Work) and record a fuller description of the Instance (for the paperback).
> We are very much aware of the cataloging practices in the past.  We're looking forward to a bibliographic ecosystem of the future, where we hope to see a greater demarcation between things.
> Kevin
>> -----Original Message-----
>> From: Bibliographic Framework Transition Initiative Forum
>> [mailto:[log in to unmask]] On Behalf Of Karen Coyle
>> Sent: Friday, May 17, 2013 11:23 AM
>> To: [log in to unmask]
>> Subject: Re: [BIBFRAME] What's an instance?
>> Kevin, what people are telling you is that there is a good reason why
>> libraries do not create separate records for things like hardcopy v.
>> trade paperback, and they would not want separate instances for these.
>> This is a decision that was made many, many decades ago. The data that
>> you will have in those MARC records will be identical for the two ISBNs,
>> which means that the record does not describe both. You only have one
>> instance description.
>> kc
>> On 5/17/13 7:27 AM, Ford, Kevin wrote:
>>> Thanks, Jörg.
>>> One very quick point:
>>>> Do not rely on ISBN as a unique
>>>> identifier.
>>> -- Just to be absolutely clear, we're not trying to use an ISBN as an
>> identifier.  Indeed, relating Instances that use the same ISBN is not
>> even in our view at present (and may never be, for all the reasons
>> given about ISBNs to date).  Likewise, there are no plans to relate
>> Works that have Instances that share ISBNs.  But, if we have a MARC
>> record with three different ISBNs in it, as a general rule, we are
>> making the assumption that each represents a distinct Instance of the
>> Work being described (in our records there are often two ISBNs - one
>> for the hard cover and the other for the paper back).  Now, the
>> calculus will change if we can reasonably determine we are dealing with
>> a MARC record that describes a multi-volume Work, for example.  The
>> three ISBNs could mean something different in such a scenario.
>>> *Per MARC record*, ISBNs offer a guide to splitting said MARC record
>> into a BIBFRAME Work and one or more BIBFRAME Instances.
>>> Yours,
>>> Kevin
>>>> -----Original Message-----
>>>> From: Bibliographic Framework Transition Initiative Forum
>>>> [mailto:[log in to unmask]] On Behalf Of Jörg Prante
>>>> Sent: Friday, May 17, 2013 9:19 AM
>>>> To: [log in to unmask]
>>>> Subject: Re: [BIBFRAME] What's an instance?
>>>> Kevin,
>>>> yes, I can run an analysis over a snapshot of our union catalog
>>>> comprising of around 4.847.212 ISBNs. It will take some time to
>> write
>>>> the code.
>>>> Due to the official policy of the ISBN agencies, the reuse was
>>>> strictly forbidden - but the ISBN number pool is segmented into
>>>> countries and their publishers, which take charge over the number
>>>> use. There is no technical mechanism to enforce correct use or to
>>>> grant or revoke ISBNs by a third party. Beside applying the same
>>>> to different editions, there are other cases. Some publishers wanted
>>>> to save resources and simply broke the ISBN rules when they ran out
>>>> of money (or they were rejected from receiving more ISBN numbers).
>>>> They started to recycle ISBNs of books they had out of print for
>> many
>>>> years, hoping no one will ever notice. Or, publishers did not
>> properly file their ISBN pool usage.
>>>> For example, when publishers took over other publisher's business
>> and
>>>> their ISBN pools, there was no safe way of verifying what ISBNs were
>>>> already taken or not. ISBN was in active use as primary identifiers
>>>> in ISBN registers for no longer than 5 or 10 years. It's giving us
>>>> headaches for a very long time. Do not rely on ISBN as a unique
>>>> identifier.
>>>> Jörg
>>>> Am 16.05.13 23:54, schrieb Ford, Kevin:
>>>>>     Is there any way to quantify, for example, how often publishers
>>>> actually reuse ISBNs in different editions (is that even tecnically
>>>> permitted?)?
>> --
>> Karen Coyle
>> [log in to unmask]
>> ph: 1-510-540-7596
>> m: 1-510-435-8234
>> skype: kcoylenet

Karen Coyle
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ph: 1-510-540-7596
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