The present invention relates to a system to implement a method of importing exporting data originating from a database by way of an XML file. The export method includes the steps of: selecting data from the database; requesting an export of the selected data; verifying that the selected data are not reserved in the database; constructing an export set comprising the selected data that are not reserved; reserving the selected data not reserved in the database; generating a data exchange file comprising the data of the export set, the data exchange file being constructed according to a data exchange file model, the file model describing types of data, links between the types of data, existing in the database; and transferring the exchange file generated to the second computer.