For my research survey i m analyzing db4o. i need some material(thoery
and concepts) about QBE and S.O.D.A. i have visited a lot of sites but
they all explain QBE in terms of relational database. I need to find
out that how QBE works and how it is different from OQL.is S.O.D.A
extension of QBE?.Can any one help me regarding this.

Thanks,