The proxy services area defines protocols and API's that enable proxies extend their services beyond protocol relays and caching. The working group will develop documents defining the architecture, policy model and elements, and terminology. Protocols for delivering new services and policies related to their execution will be defined and developed. Other protocols, allowing the services to communicate information about the protocol elements of the proxied protocol, will be developed. A security architecture for the administration of proxies with third party services will be defined. The API to core services, such as protocol control and use, will be defined.