Hello Maewyn,
I would like you to point out the following summary regarding the use of
Persistent Identifiers discussed in the "diglib" list which comprises
information about practical experiences of three institutions - National
Agricultural Library (NAL), University of Wisconsin Madison Libraries and
the German National Library (Die Deutsche Bibliothek) - and MIT/HP DSpace
project.
For further information regarding the URN management at Die Deutsche
Bibliothek do not hesitate to contact me.
Best regards,
Kathrin
_______________________________________
Kathrin Schroeder
Die Deutsche Bibliothek
Deutsche Bibliothek Frankfurt am Main
Information Technology Department
Projekt CARMEN-AP4 / EPICUR
Adickesallee 1
D-60322 Frankfurt am Main
Telefon: +49-69-1525-1480
Telefax: +49-69-1525-1799
mailto:[log in to unmask]
http://www.ddb.de
> -----Ursprüngliche Nachricht-----
> Von: Maewyn Cumming [mailto:[log in to unmask]]
> Gesendet: Mittwoch, 26. Februar 2003 10:47
> An: [log in to unmask]
> Betreff: Persistent identifiers
>
>
> Has anyone done any work on the different systems for
> persistent unique
> identifiers? I need to make recommendations regarding the
> best way forward
> for the UK government and would love to see some independent
> research, or
> hear about people's experience.
>
-----Ursprüngliche Nachricht-----
Von: Aaron L Brenner [mailto:[log in to unmask]]
Gesendet: Sonntag, 23. Februar 2003 21:21
An: [log in to unmask]
Betreff: [diglib] summary of responses: persistent identifiers, Handle
system
The following is a summary of responses that I received to my earlier
question
about use of persistent identifiers, and the CNRI's Handle System in
particular.
Thanks again to all those who responded.
Out of four substantial responses, three came from institutions using the
Handle
System, and one from an institution using an alternative scheme.
-The National Agricultural Library (NAL) has implemented the Handle system.
An
identifier, which becomes part of the handle, is automatically generated
when
metadata for an electronic resource is created. The handle is stored in an
internal management database, which allows for automation in deriving
various
metadata and registration of the handle with CNRI. As the handle is
registered
with CNRI, the identifier is appended to CNRI's handle-resolving server
(hdl.handle.net) in order to allow for resolution of the handle via HTTP.
The
resulting identifier is placed in HTML META tags in the resource itself, and
placed in the 856 field of MARC records that are distributed to the AGRICOLA
(AGRICultural OnLine Access) database.
-The University of Wisconsin Madison Libraries has implemented the Handle
system. They use a local proxy server for resolving Handles to URLs, but
also
plan to incorporate handle-awareness within their digital library
middleware,
for locating stored digital objects and their metadata. They are also
interested in using handles for user authenication/authorization. Finally,
they
are planning to implement a DBMS (BerkelyDB) for storing handles, rather
than
the jdb file that is the default implementation.
-The German National Library (Die Deutsche Bibliothek) uses a persistent
identification scheme in co-operation with library associations and
university
libraries. Kathrin Schroeder writes, "The established URN management are
based
on a co-operative and distributed URN assignment by the participating
university
libraries, a centralized registration, resolution process and archiving by
Die
Deutsche Bibliothek. That was initiated within
the framework of the "CARMEN-AP4" project
(http://www.bis.uni-oldenburg.de/carmen_ap4/index_eng.html). "
"In October 2002 at Die Deutsche Bibliothek started a new project concerning
persistent identifiers: "EPICUR - Enhancement of Persistent Identifier
Services
- Comprehensive Method for unequivocal Resource Identification".
This project focusses on the expansion of the established URN-service at Die
Deutsche Bibliothek. A web-presentation for further information is under
construction."
In order to resolve identifiers, the system uses the Persistent
Uniform-Resource-Locator- Resolving mechanism based on the standard HTTP
redirect. To quote again: "The client is able to execute an URN query in the
form of an URL transaction in the normal fashion. This means that the user
creates an URN request in form of the URL-presentation of an URN,
e.g.http://nbn-resolving.de/urn/resolver.pl?urn=urn:nbn:de:bsz:93-opus-59.
We
only use this resolving mechanism because of the independence to a
specialclient
browser or hardware. By the use of this mechanism we are able to resolve one
URN
to several URLs (see http://nbn-resolving.de/Resolving-eng.html)."
Finally, the URN is propagated by inclusion in the bibliographic record and
delivered to other bibliographic information services of Die Deutsche
Bibliothek.
-The MIT/HP DSpace project has implemented the Handle system. Every
"community", "collection" and "item" created in the DSpace system is
assigned a
handle. Handles are resolved by first passing through CNRI's handle.net
server,
and then to a local handle server which resolves the rest of the Handle.
Handles
are stored in the DC Identifier element for each item record, are indexed
for
local searching, and exposed via OAI for harvesting. MacKenzie Smith
writes,
"Using Handles made the most philosophical sense to us. It does, however,
introduce a dependency on CNRI that some folks worry about, and has made the
system slightly more complicated than it would have been had we just used
persistent URLs. We felt that in the long run it was better not to rely too
heavily on the http protocol, and wished to avoid any more locally-written
code
than necessary, so we went with Handles."
--
Aaron L. Brenner
Digital Projects Librarian
University Library System
University of Pittsburgh
7500 Thomas Blvd., Room 306
Pittsburgh, PA 15260
Phone: 412.244.7526
Fax: 412.648.7742
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