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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='tab-interval:36.0pt'><div class=WordSection1><p class=MsoNormal><span style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D'>Hi Thomas<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'>I’m afraid the issue you are raising is out of the scope of OAI, as IMHO it is part of the “upper level” of the business.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'>In fact, in a properly designed data/entity architecture, records should have two identifiers, one absolute, purely logical, and persistent (like for example an ISBN number, DOI, National Bibliographic Number, etc., with no need to be sequential…), and eventually other “technical” (as the index in the database, for example, which tend to be sequential, and this OAI takes advantage of that). Both can even have be represented by elements in the data record… <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'>The problem is that when people design the systems they usually only use the second, either by ignorance or by simplicity… For example, if you use logical identifiers, you also must have a mechanism to merge records if you discover duplicates, and in that case you must keep the two previous identifiers associated to the new record, etc.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'>In a scenario of a system properly<span style='mso-spacerun:yes'> </span>designed, if the OAI identifiers change, that should be seem “at the OAI level” as a simple change in the record, so all the records should be harvested again, and end of story at the OAI level…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'>Than it’d be up to the next level of the business to discover what really was the change in the record and how it affects the business of the service provider that harvested it… If the data provider did it properly, by using the logical identifiers the service providers can always make the association of the new records with the old ones… If not, then I’m afraid the only options for the service provider are either also throw the old harvested records (which can be nasty if the service provider already used them to create any kind of added value, such as associate them to records in other data sets…) or develop its own heuristics to try to recover the ideal scenario (for example, to deal with that in the REPOX framework, when a data set is harvested and the data has no logical identifiers, we make it possible for REPOX to generate those identifiers, based on simples techniques that use the content of the record but we assume in most of the cases will generate the same identifier if the record is not changed in some key identifiers –this is just a simple heuristic, not 100% effective, but at <span class=SpellE>leat</span> we try ;-)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'>Best!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'>José Borbinha<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText style='mso-outline-level:1'>-----Original Message-----<br>From: <a href="mailto:oai-implementers-bounces@openarchives.org">oai-implementers-bounces@openarchives.org</a> <a href="mailto:[mailto:oai-implementers-bounces@openarchives.org]">[mailto:oai-implementers-bounces@openarchives.org]</a> On Behalf Of Fischer, Thomas<br>Sent: 06 December 2011 15:21<br>To: <a href="mailto:oai-implementers@openarchives.org">oai-implementers@openarchives.org</a><br>Subject: [OAI-implementers] Change of identifiers<span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Hello,<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>I am wondering if there is a standard way to change OAI identifiers.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>For example, we might restructure our collection, or will have to split some items that were under one identifier into several ones. I could even imagine something like "throw away everything from this set from this OAI Service Provider and collect everything anew".<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Is there a way to communicate this to my OAI clients?<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Best regards<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Thomas Fischer<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>--<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Dr. Thomas Fischer<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Research and Development Department (RDD)<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Göttingen State and University Library<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Georg-August-Universität Göttingen<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>37073 Goettingen<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>Germany<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><a href="http://www.sub.uni-goettingen.de/">http://www.sub.uni-goettingen.de/</a><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>_______________________________________________<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>OAI-implementers mailing list<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'>List information, archives, preferences and to unsubscribe:<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><a href="http://www.openarchives.org/mailman/listinfo/oai-implementers">http://www.openarchives.org/mailman/listinfo/oai-implementers</a><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p> </o:p></span></p></div></body></html>