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matrix-spec/content/rooms/v2.md

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---
title: Room Version 2
type: docs
weight: 20
---
This room version builds on [version 1](/rooms/v1) with an improved
state resolution algorithm.
## Client considerations
There are no client considerations introduced in this room version. Clients
which implement the redaction algorithm locally should refer to the
[redactions](#redactions) section below for a full overview of the algorithm.
## Server implementation components
{{% boxes/warning %}}
The information contained in this section is strictly for server
implementors. Applications which use the Client-Server API are generally
unaffected by the details contained here, and can safely ignore their
presence.
{{% /boxes/warning %}}
Room version 2 uses the base components of [room version 1](/rooms/v1),
changing only the state resolution algorithm.
### State resolution
{{% added-in this=true %}}
{{% rver-fragment name="v2-state-res" %}}
## Unchanged from v1
The following sections have not been modified since v1, but are included for
completeness.
### Redactions
{{% rver-fragment name="v1-redactions" %}}
### Event format
Events in rooms of this version have the following structure:
{{% definition path="api/server-server/definitions/pdu" %}}
### Authorization rules
{{% rver-fragment name="v1-auth-rules" %}}
### Canonical JSON
{{% rver-fragment name="v1-canonical-json" %}}