1) Search google for "sp556.sdd" and watch it return precisely "0" results.
2) I'm sure that if it does exist, Driver will certainly know what it is.
You really need to start curbing some of the nonsense chatter and keep the discussion technical. A lot of these posts are just creating noise within the knowledge base. Also, you should avoid insulting people -- "You wouldn't know what it is!" -- isn't going to do you any favours.
If you are trying to implement a database, you could always get the source code for MySQL or PostgreSQL and have a read through that.
Cheers
ZB