I'm reading this article by Teo Lachev:

We're trying to extend these interfaces so as to access multiple Oracle Data stores and are following his implementation as well as the FIS Sample implementation.

I am having CONSIDERABLE difficulty understanding which interface extension to build our SQL QUERY in.

It looks as though TEO is actually accessing an XML file and the FIS example is accessing the file system.

What we need is an example of an implementation with a database.