In ODaP the publications in the institutional repository (IR) and the datasets in DVN are linked in such a way that a user searching the IR can follow links to the datasets in DVN and vice versa an user accessing the Tilburg University dataverse in DVN can follow links to the repository records describing the related publications. So the linking in ODaP is symmetrical: if A links to B then B links to A. This is implemented in such a way that only in one system the links are maintained. The system that is the source of the links is regularly consulted for adding the reverse links to the other system.
The source system for the links is DVN. In the description of a dataset the permalink of the related publication is added. A permalink refers to a page of the Tilburg University search system Get It!. Such a permalink page functions as a splash page or a jump-off page of the publication in the repository. In this way studies in DVN link to the Open Access version of the related publications.
DVN uses the DDI standard (version 2) as metadata format for the description of the datasets. The permalinks of the related publications are stored by us in the DDI element /codebook/stdyDscr/othrStdyMat/relPubl (Related Publications). The DDI records of DVN can be harvested by using the OAI-PMH protocol. The ODaP harvester that harvests DVN, sends the DDI records to the Enrichment Server by using the SRU Record Update protocol. The Enrichment Server uses the permalinks stored in the DDI records to determine the records of the Tilburg University search system Get It! that has to be enriched with the DDI. The records in Get It! come from different sources. One of them being the Tilburg University Repository based on the ARNO system. The ARNO system has no end users interface itself. For this iPort and Get It! are used. Getting the DIDL/MODS records supplied by ARNO into Get It! is done by a harvester as depicted in the following diagram.
Note that the harvesting of the DIDL/MODS from the repository is first and the harvesting of the DDI from DVN comes next. In this way the DIDL/MODS as a representation of a publication is enriched with the DDI as a representation of a dataset and not the other way around. The Enrichment Server can also be used to enrich a search engine record with other information that is coming from an external source. This enriched whole can also be represented as an OAI ORE Resource Map.
This way of enriching bibliographical records is also implemented for Economists Online and for the European Values Study portal. ODaP is most similar to Economists Online. Because the ODaP implementation is still experimental, I will give an example of Economists Online.
This permalink http://www.economistsonline.org/publications?id=eprints-lse-ac-uk:oai:eprints.lse.ac.uk:3607 contains a link to a dataset in DVN. The DVN dataset descriptions have a handle as an unique identifier. In this case the handle is hdl:1902.1/12930 that is resolved by http://dvn.iq.harvard.edu/dvn/study?globalId=hdl:1902.1/12930. When we follow the latter link DVN represents a record with in Related Publications the permalink of the publication.