I have a vision of a future in 5, more likely 10, years where I'll send my database out for <linked?> authority work and to automagically change descriptive elements from AACR2 to RDA.  I think this kind of system will work better for popular, not research, public libraries.  I think that because popular public libraries have greater turnover of material and are not preserving older material.  Still, it won't be perfect, but part of what will drive such a decision is a better record display from having the consistent data.  I can't see my ILS trying to reconcile 245 $h and 336, 337, 338 to give me the same icon for type of material, and I can't see BIBFRAME reconciling these different MARC data elements as well.

But, first we get to see the ugly of my ILS trying to get its SQL for MARC to line up with its SQL for BIBFRAME. Good times!

Douglas E. Williams

Technical Services Manager

Campbell County Public Library

901 E 6th St.

Newport, KY  41071


Phone:  859-572-5035, ext. 26

Fax:  859-572-5037

Email: [log in to unmask]

On Thu, May 30, 2013 at 11:51 AM, Simon Spero <[log in to unmask]> wrote:
On Thu, May 30, 2013 at 9:41 AM, Trail, Nate <[log in to unmask]> wrote:
Yes, especially since the bulk of our content at first will be MARC, transformations from what was in MARC yesterday, today and tomorrow will be there.

Technically, the end requirement is to provide a format that is a credible replacement*  for MARC(21)  in an RDA context (appendix M of the RDA Test report).  However, modeling the semantics of the AACR2 would seem to be a necessary endeavor along the way.

The underlying (conceptual) model of the bibliographic universe ought to be one that can be mapped to all major systems.  The properties of these mappings are somewhat complicated. To use a recent subject of discussion as a simple example, if one starts with MARC-21 data that contains a non standard textual string and a coded relator, the mapping into a semantic model might not preserve the non-standard string.  MARC-21 data using a standard string might map to the same semantic representation.  
Such  mapping would not be invertible, since the non-standard string would not have been preserved. 

[I have some concerns and suggestions about some of the  work that has been done and some work that has not been done under the BIBFRAME which I will explore under separate cover.]