[Zope] From ZODB to RDBMS

Let's suppose that at the beggining of a site development, it was decided to use ZODB as the only one storage. Let's also suppose that after a few months, by non-technical issues (sticking to ZODB couldn't be option), it was decided to switch the whole database to a high-end RDMS like Oracle. How would you export zope objects' data to a relational database? Thanks in advance, Ausum