CEDAR is now a central component of ARP, Hungary’s national federated research data repository platform. Developed by the HUN-REN SZTAKI Department of Distributed Systems in collaboration with the Center for Social Sciences and the Wigner Research Centre for Physics, ARP provides a robust infrastructure for publishing and managing research data across all disciplines in Hungary.

CEDAR in the ARP Stack

To meet the diverse metadata needs of Hungary’s research community, the ARP platform integrates several open tools—Dataverse, RO-Crate, and CEDAR—each playing a distinct role. Within this architecture, CEDAR serves as the Schema Registry—the authoritative source of JSON Schemas used to define and validate structured metadata across the ARP ecosystem.

Researchers use CEDAR’s drag-and-drop interface to design metadata schemas that are:

• Installed into Dataverse as metadata blocks,
• Used in RO-Crate to annotate file-level metadata, and
• Referenced in ARP’s federated search infrastructure to power semantic queries.

This allows rich, ontology-backed metadata to be authored once in CEDAR and reused throughout the national data infrastructure.