DB Design for dynamic data objects

[roadwarrior]

Hi

I have an interesting design issue.

I want to create a database design were a custom type objects can be created, linked and retrieved.

I am planning to design a framework which will provide user a capability to define his own object structure and store it. He should be able to retrieve the values based on the fields defined in his objects.

I am planning to have XML to pass the information between client and the server, but I am struggling with coming up with an acceptable database design for this.

I want to design DB considering storing capacity of upto 40,000 records and custom objects created upto 200.

Any ideas or guldens will be highly appreciated.

Thanks