>This is a very interesting quest and I hope you check in from time to time with your findings. For what it's worth, object-oriented DBMSs are not a new concept. I first heard about them at a database development conference in 1989. I don't know why they haven't caught on more. Maybe Craig is right that performance is the issue.

Thank you for your suggestions.
IMHO Cache' is not object-oriented DBMS. Their "post-relational" concept is more attractive from just storing objects in database or maitaining object layer on top of RDBMS.

We will continue investigating and check our test projects. I understand that EVERY new language is usually sick in IDE, error handling, etc. (First tool for HTML was also text editor even without syntax highlight). But while this could be fixed in future it is not an issue. And Cache' tools are developing.

At the moment we do not plan to use Cache' ObjectScript for extensive programming. We just want to define, store and query our data in more natural way corresponding to complex logical structure of our data domain. Most of our data analysis code (and client GUI) will be still VFP and .NET applications and servers.