Hi everyone Currently, I am planning to apply the boost serialization library to my entity objects for allowing me to serialize them to XML for transmission over SOAP. I would also very much appreciate the possibility to store these entities in a relational database, if possible without any additional effort. Thinking of this, the possibility of creating an sqlite implementation of the archive class came to my mind. Is the archive interface suitable for such a task, thinking of issues like primary key management and so on? Or does such an implementation already exist? Thank you for any recommendations and best regards Pascal