Opus 4

Opus 4 is a high-performance open-source repository platform built for the professional management and publication of electronic academic documents.

Opus 4 serves as the primary technical foundation for institutional repositories (managed by KOBV). This PHP-driven system utilizes an Apache Solr backend to deliver sub-second search results across massive document collections. It automates the entire publication lifecycle: from initial user upload to long-term archiving and metadata distribution via OAI-PMH 2.0 interfaces. By adhering to DINI certificate requirements, it ensures that research outputs remain discoverable and persistent through standardized persistent identifiers (URNs) and rigorous metadata validation using Dublin Core standards.

https://opus4.kobv.de/