[Dspace-general] Fwd: RE : Replacing a bitstream and getting an updated checksum value in the metadata

[Victoria Rasero]

I'm very interested in knowing an explanation and a  solucion for updated
checsum value.
Anyone could explain it?
Many thanks.
--------------------------------------------------------------------
Victoria Rasero
Biblioteca
Universidad Carlos III de Madrid
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---------- Forwarded message ----------
From: Tellier, Stephane <stephane.tellier at cgi.com>
Date: 23-may-2007 23:21
Subject: RE : [Dspace-general] Replacing a bitstream and getting an updated
checksum value in the metadata
To: Sunyeen Pai <sunyeen at hawaii.edu>, dspace-general at mit.edu

 Hi Sunyeen,

we actually have the same needs in our project : some bitstreams must be
updated in DSpace to contains URLs generated after the ingestion (like
handles).
We do that by making a ItemImport --replace immediately after doing a
ItemImport --add with the import tool.
We run cleanup after.
Since ItemImport --replace is a standard feature in DSpace, there shouldn't
be any problems with the checksum...
Alas we're not ready yet to verify this but we're close (still in DEV/TEST
mode).
Maybe someone can confirm that the checksum is ok after doing some replaces
with the ItemImport?



------------------------------
*De:* dspace-general-bounces at mit.edu de la part de Sunyeen Pai
*Date:* mer. 2007-05-23 16:31
*À:* dspace-general at mit.edu
*Objet :* [Dspace-general] Replacing a bitstream and getting an updated
checksum value in the metadata

 Greetings,

We are just at the beginning of setting up our repository.  I was wondering
if you could advise us on this question:

Background: We are working with an online journal editor who, in the past,
has included the paper's url in the footer of the paper itself.  We would
like to accommodate this, but is this feasible?  I am pretty sure handle ids
are not assigned until the document is completely ingested, so I don't think
there is a way of knowing what a url will be before the document has been
ingested (please correct me if I am wrong).  We were looking at, therefore,
waiting for the document to be "archived", getting the assigned handle, then
editing the pdf to reflect the new url.  Then we would "replace" the
bitstream/document in the item record with the updated bitstream.

Problem with this solution:  It is easy to remove the original bitstream and
add in the corrected one, but then the checksum information is no longer
correct.

Questions:  Can DSpace re-run checksums on corrected/replaced bitstreams so
that the new checksum value is automatically reflected in the item's
metadata (dc_provenance)?  Or is this something that must be corrected
manually in the metadata?

ps:  If there is no easy way to do this, we will get back with the editor.

Thank you,
--Sunny Pai

University of Hawaii at Manoa Library





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