The Extensible Provisioning Protocol (EPP, STD 69) is an application-layer client-server protocol for the provisioning and management of objects stored in a shared central repository. The Registration Data Access Protocol (RDAP, STD 95) is a protocol for retrieving registration data and metadata from both Domain Name Registries (DNRs) and Regional Internet Registries (RIRs).

The Registration Protocols Extensions Working Group (REGEXT WG) is responsible for maintenance and operations of both EPP and RDAP. Also, REGEXT provides practitioners, domain registries and registrars, number resources registries, and other interested parties who wish to share operational experience, challenges, and lessons learned, a venue to engage in discussions around the operational requirements of EPP and RDAP deployments.

## Work Scope

The WG is responsible for specifying updates and extensions to these protocols, documenting operational issues and specifying mitigations to those, providing guidance for defining extensions, and elaborating deployment recommendations. Also, the WG is responsible for maintenance of the registration procedures for the EPP and RDAP IANA registries. 

Additionally, the WG will publish documents addressing interoperability issues related to EPP and RDAP. This includes, in particular:

* Data formats for exchanges between registration entities that need insertion or extraction using EPP or extraction using RDAP.
* New application transport mappings for EPP following relevant and appropriate IETF standards to address operational gaps for which at least one domain registry and at least one domain registrar have made a commitment to deploy.
* Best practices for the deployment and operation of EPP and RDAP, including security and scalability considerations.

The WG is responsible for the maintenance of RFC 3735 (Guidelines for Extending the Extensible Provisioning Protocol (EPP)), including progressing it from Informational to Best Current Practice.

The WG may publish documents in all tracks.

## Liaison and Coordination

The WG will follow existing BCPs (mainly BCP 56 on Building Protocols with HTTP) and will seek advice from the WIT area on HTTP and transport matters, in particular. Likewise, the WG will sollicit feedback from other relevant WGs (e.g., DNSOP and SIDROPS) as needed.

The WG will discuss revisions of EPP and RDAP registration procedures with past and current Designated Experts for such registries to take into account their experience.