[RESOLVED] XML Database - Newbie Question

Alright, I'm somewhat new to XML, but I have interest in it due to the fact that I may have to use it in a program I develop.

Basically, I want to make a map. This map will support navigation to north, east, south, or west. How would I represent this in a database and make navigation to each direction simple?

All I'm really asking for is maybe a quadrant like this:
| 1 | 2 | 3 |
| 4 | 5 | 6 |
| 7 | 8 | 9 |

So North from 5 would be 2, etc...

How would this be represented in an XML database? Any examples or even tutorials to help me get started would be really useful.
Edit: I'll be coding everything else in C#.