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Virtual World Region Agent Protocol

Document Charter Virtual World Region Agent Protocol WG (vwrap)
Title Virtual World Region Agent Protocol
Last updated 2011-05-18
State Approved
WG State Concluded
IESG Responsible AD Peter Saint-Andre
Charter edit AD (None)
Send notices to (None)


The working group will define the Virtual World Region Agent Protocol
(VWRAP) for a collaborative 3-dimensional virtual environment. The
protocol permits users to interact as digital representations called
"avatars". An avatar exists in at most one location within a shared
virtual space. Conforming client applications use the protocol to
manipulate and move the user's avatar, create virtual objects,
interact with other users and their surroundings, consume and create
media and information from sources inside and outside their simulated

A virtual space can be partitioned into "regions" to facilitate the
computational and communication load balancing required to simulate
the virtual environment. A region provides the service environment in
which inhabitants and objects can interact. A region uniquely
represents a partition of the virtual space; they are not a mechanism
for load balancing by having multiple instances of the same space.
Different regions may be administered by different organizations. The
state of a virtual world is independent of the client applications
that access it and may persist between user sessions.

Within a VWRAP virtual environment, services may be deployed by
multiple organizations having varying policies and trust domains. The
VWRAP protocol will provide the mechanisms for these services to
interoperate, when permitted by policy. The working group may document
examples of policies applicable to a VWRAP environment.

Foundational components of the protocol include the publication of:

  • an abstract type system, suitable for describing the application
    protocol in an implementation neutral manner,

  • a security model describing trust relationships between
    participating entities,

  • guidelines for the use of existing authentication and
    confidentiality mechanisms,

  • an application-layer protocol for establishing the user's avatar
    in a region,

  • an application-layer protocol for changing an avatar's position,
    including moving between regions,

  • format descriptions for objects and avatars, and

  • an application-layer protocol for identifying entities, and
    requesting information about them.

The protocol defined by this group will carry information about the
virtual environment, its contents and its inhabitants. It is an
application layer protocol, independent of transport, based partially
on these previously published internet drafts:

The protocol should describe interaction semantics independent of
transport, leveraging existing standards where practical. It should
define interoperability expectations for server to server interactions
as well as client-server interactions. Though the protocol is
independent of transport, early interoperability trials used HTTP(S)
for non-real-time messages. The working group will define specific
features that must be replicated in other transports and will define
the use of HTTP(S) as a transport of protocol messages.