porting Jena onto new storage facility

[David Jordan]

I am considering porting Jena onto a new storage framework. I had looked at 
doing this a few years ago, but never did it. Now may be a better time. It also 
runs in a cloud environment that supports multi-processing, etc. But the first 
step is mapping of the data to the storage. I briefly looked at the latest 
source. I thought there were some specific interfaces I had to implement to 
plug in a new storage layer, but I have not found it yet. Any pointers are 
appreciated.