French government has launch in 2000 a public debate about conservation of data and electronic documents. Due to the widespread use of Internet and extranet technologies, especially with electronic document exchange, we had have to adapt the politic of document conservation to this new challenge: “avoid the lack of memory in public administration”. A guide-book was produced. This guide-book is an important step to introduce a reflection about the conservation and to give some guidelines. Improving XML is the other principal result of the guide-book Making of a guide-book French government has published a “request for comment” on its Internet site during three months. It was issued from a document produced by the European community in 1996. This document described organisation, formats and support for data and document conservation, but it was out of date. About fifty answers were made by different experts, so we were able to produce a synthesis and a guide-book to the conserva...