Content Object Repository Discovery and Resolution Architecture (CORDRA)

Cordra is an open source system for managing digital objects with resolvable identifiers at scale. It is based on the [[Digital Object Architecture (DOA)]]. Cordra can be deployed as a single instance or as a distributed system. It is neither a database or an index:

Cordra offers a unified programmable interface across your storage system and indexing system, and manages information logically as digital objects. Digital objects are typed, and Cordra enforces schemas on user-supplied JSON information.


  • Configurability. Schemas, business rules, access controls, and much more can be configured using settings and lifecycle hooks, all using the built-in admin interface.
  • Data Consistency. Enables robust internal machinery to withstand partial system/network failures to ensure consistent system states between storage and indexing services.
  • Scalability. Enables horizontal scaling and concurrency techniques to support large-scale demand. Provides a load-sharing front to backend services.
  • APIs. Provides REST, DOIP, and IRP interfaces. REST APIs reduce the entry barrier. DOIP operations allow extensibility and interoperability. IRP enables identifier resolution.
  • Developer Friendly. Requires little to no coding to store, protect, search, and retrieve digital objects. Client libraries in Java and JavaScript are provided.
  • PKI and Hashing. Server and client authentications can be handled via PKI in addition to passwords. Digital objects can be hashed and linked for ensuring integrity
Content Object Repository Discovery and Resolution Architecture (CORDRA)