  In this report we show how to manage a distributed hierarchical structure
representing a file system. This structure is optimistically replicated, each
user work on his local replica, and updates are sent to other replica. The
different replicas eventually observe same view of file systems. At this stage,
conflicts between updates are very common. We claim that conflict resolution
should rely as little as possible on users. In this report we propose a simple
and modular solution to resolve these problems and maintain data consistency.
