I see PREMIS Intellectual Entity as a bibliographic resource which could theoretically be either work, expression, manifestation or item; PREMIS does not define IE specifically. We have often said that the PREMIS intellectual entity is generally what you would provide a bibliographic record for (and thus the PREMIS intellectualEntityIdentifier would often link to a bibliographic record), so that could make it a manifestation,although intellectual entities are out of scope for PREMIS in terms of giving metadata elements beyond an identifier. An Intellectual Entity can have one or more PREMIS representations, and a representation may be equivalent to a manifestation in some cases. Much of what PREMIS describes is at a lower level than what is covered by RDA. A PREMIS file object (much of the metadata semantic units in PREMIS are about file objects) is more like an item part, and not really covered by RDA. For instance, if you have a 150 page book digitized as 150 separate PDF files, RDA would treat the digitized book as a whole as a manifestation and not at a lower level (i.e. not each digitized page). PREMIS would treat that whole (i.e. a set of files) as a representation. If that book is available in 2 different digital formats, PDF (as 150 separate files) and an ebook format (1 file), I think RDA would treat these as different manifestations assuming that the content is the same. (Although, is it really the same if the functionality is different because of the capabilities of different file formats? I don't know the answer to this.) PREMIS considers these 2 representations with 150 file objects in one and 1 file object in another.
There is a data element in RDA for Digital file encoding format, which is equivalent to PREMIS format designation. In the analysis done in considering additions to MARC for RDA (Discussion Paper No. 2008-DP05/3) <http://www.loc.gov/marc/marbi/2008/2008-dp05-3.html> the decision was made not to code for these as file encoding formats as a controlled list because of the difficulty of maintaining such information. Encoding formats can change rapidly and digital materials can be migrated to new formats; the paper pointed to the Global Digital Format Registry as a source of this information and the ability to record the information at a more granular level in PREMIS. As far as I can tell this may be the only RDA data element that directly corresponds to a PREMIS object element (although there are some data elements for format specific technical data in RDA).
I'd welcome any discussion on this issue-- I expect that there are other answers to the question.
Rebecca S. Guenther
Senior Networking and Standards Specialist
Network Development and MARC Standards Office
Library of Congress
101 Independence Ave. SE
Washington, DC 20540-4402
(202) 707-5092 (voice)
(202) 707-0115 (FAX)
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>>> Yaniv Levi <[log in to unmask]> 7/19/2009 6:38 PM >>>
Has anyone given any thought to the relations between the PREMIS data
model and the RDA one? It is not clear what should be the relations
between the two if any; on the one hand it seems that representation and
manifestation correlate well on the other hand the IE might just be an
item in the RDA model and I can think of other options as well.
Any thoughts on the matter would be welcomed.
Yaniv Levi, Rosetta (Digital Preservation System) Product Manager
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