Typically, the identifier of an Item exposed through OAI-PMH protocol is composed with format <prefix>:<handle> , where prefix, is defined as follows (from oai.cfg ):
# OAI persistent identifier prefix
# This field is used for two purposes:
# 1. As your OAI-PMH <repositoryIdentifier>
# 2. As the prefix for all Identifiers in OAI-PMH (Format is "oai:${oai.identifier.prefix}:${handle.prefix}")
# The OAI-PMH spec requires this prefix to correspond to your site's hostname. Therefore, by default,
# DSpace will set this configuration to the hostname from your ${dspace.ui.url} configuration.
# However, you may override that default value by uncommenting this configuration.
# oai.identifier.prefix = example.com
However, it is possible to provide any DSpace-CRIS Item with a custom OAI-PMH identifier, by setting the metadata dspace.legacy.oai-identifier. Value set in such metadata will be used as identifier for the item exposed on OAI - PMH.
