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--- en:user_advanced:oai_server_gs3 [2018/07/30 23:27] – [Metadata Formats] kjdon
+++ en:user_advanced:oai_server_gs3 [2018/07/30 23:32] – [OAI Identifiers] kjdon
@@ Line 159: / Line 159: @@
 <code><element name="dc:date"><mapping select="allvalues" elements="dc.Date,gs.Date"/></element></code>
 This will output all dc.Dates and gs.Dates as dc:date.
+=== OAI Identifiers ===
+Prior to July 2018, an extra oai_dc:identifier element was automatically added to the metadata list, containing a link to the document. The values used would be chosen from the following list, using the first available value:
+  * gs.OAIResourceURL - if this metadata was set for a document, this would be used as the identifier URL. This enables you to link to the document outside of Greenstone.
+  * a link to the source document, eg PDF, Word files. (gsf:link type="source">)
+  * a link to the Greenstone version of the document. (<gsf:link>)
+After July 2018, this was modified to be specified via the OAIConfig in the same way as other metadata mappings are specified.
+<code><element name="dc:identifier"><mapping elements="gs.OAIResourceURL,gsflink.source,gsflink.document" select="allvalues"/></element>
+</code>
+This way, users can customize further which identifiers they want - they can use all of them, as the above mapping specifies.