oodb <-> rdb

Hi Folks, I am in the process of looking into the possibility of translating Object-Oriented concepts to Relational concepts. I would be grateful if somebody could provide me with pointers on the following: Given an object, what needs to be considered/done for an object to be translated to a relation (or a set of relations). Similarly, given a relation (or a set of relations), what do you need to consider when re-creating the corresponding object. What issues need to be considered during the translation process? How, if at all possible, is object behaviour captured in the rel. model? What rules do you have to follow or what heuristics do you have to apply? Please send your replies to cssrddw@brunel.ac.uk Thanks, Dulan Weerasinha PS: BTW, has anybody thought about clusterring. In PC World, those guys use a NORTON utility stuff to keep files in a contiguous space, ie, they compact the disk space for efficiency. Has any such work been done for DBs (particularly for ODBs where access patterns could be complicated).