Architecture Overview

Metadata including persistent identifiers, object file locations and semantic pointers are packaged in an XML container and are distributed via OAI-PMH from repository systems to NARCIS, the resolver and the eDepot.

The transfer protocol is OAI-PMH, the packaging format is MPEG21-DIDL, the Metadata format is MODS, the Persistent Identifiers is URN:NBN, the semantic pointers are from the info:eu-repo vocabulary.

NARCIS enables to search across Open Access publications from Dutch academic institutions, and is a proxy to Google, Google Scholar, DRIVER and OpenAIRE.

The Resolver enables to resolve the persistent identifier to the most current, duplicate or long-term archive location of the publication. This allows users to persistently gain access to the publication over time, without confronting a broken link.

The eDepot provides for an archive to store and preserve the publication for the long term.

In order for the information chain to be stable, agreements need to be made how to apply the standards described above. This is done in the application profiles below.

Application Profiles Used

• OAI-PMH (transfer)
• DIDL (structure)
  • Remote Open Access (work in progress)
• MODS (metadata)
  • DAI-extension (metadata extension)
  • GAL-extension (metadata extension)
  • WMP-extension (metadata extension)
  • DSpace to MODS (metadata mapping)
  • Metis to MODS (metadata mapping)
• Persistent Object Identifiers (identification)
• Author Identifiers (identification)
• SRU (transfer) (expected!)
• KE Usage Statistics Guidelines (SURE statistics) (transfer & format)
• Enhanced Publications (format and transfer)

Vocabularies Used

• Publication Types: info:eu-repo
• Object types: info:eu-repo 
• Access Rights: Eprints Access Rights Vocabulary Encoding Scheme
• Access Rights: info:eu-repo (additional expressions)
• Versions: info:eu-repo

Identifier Namespaces Used

• Digital Author Identifier: info:eu-repo 
• Persistent Object Identifier: URN:NBN:NL:UI
• Grant Agreement Identifiers: info:eu-repo

Services Used

• DAI-API
• URN:NBN Resolver API
• SURE-Statistiscs API

Roadmap

Describe the future of the service

Image RemovedImage Added

See: Architectures