# Buffer structure

## Buffer I (Input)

Buffer I has the structure of the file to replicate.

## Buffer B (Before)

Buffer B has the structure of the file to replicate.

## Buffer O (Output)

The default structure of buffer O is the structure of the file to replicate.

This structure can be changed partly or wholly using the transformation module.

## Buffer S (System)

The structure of buffer S is fixed and contains informations like the timestamp of the transaction and its nature.

## Buffers W (Local Work), V (Global Work), X (External)

The structure of buffers W, V and X is defined using the transformation module.