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Hello Rosemary,

Media Cybernetics has developed an object-oriented database, IQbase, that 
may satisfy your requirements.  We have many clients who have requested 
similar functionality as you.  IQbase is a comprehensive, work flow 
oriented repository for images, associated data and files that lets you 
easily search, share and store any electronic data.  

Rather than go into a lot of detail here, information can be found at:

http://www.mediacy.com/index.aspx?page=IQBase 

For direct answers to your specific questions, please contact me offline. 

Teresa Shaw
Media Cybernetics
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