What are the best practices for the RCU's schemas

Hi,
I was wondering if there is some best practices about the RCU's schemas created with BIEE.
I already have discoverer (and application server), so I have a metadata repository for the Application Server. I will upgrade Discoverer 10g to 11, so I will create new schema with RCU in my metada repository (MR) of the Application Server. I'm wondering if I can put the BIEE's RCU schemas in the same database.
Basically,
1. is there a standard for the PREFIX ?
2. If I have multiple components of Fusion in the same Database, I will have multiples PREFIX_MDS schema ? Can they have the same PREFIX ? Or They all need to have a different prefix ?
For exemple: DISCO_MDS and BIEE_MDS or I can have DEV_MDS and this schema is valid for both Discoverer and BIEE.
Thank you !

What are the best practices for exception handling in n-tier applications?
The application is a fat client based on MVVM pattern with
.NET framework.
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