>Seems there is only one person left in the company that was part of the design team for that data model
>
>Is that the data model that Andy was largely responsible for? I still remember the wonderful arguments between him and Steven Black about whether or not to use a rip field or a left-right numbering scheme.
>
>It's hard to believe that it has been more than 10 years since we worked together on that project!

And many useful tricks were developed there. I still squeeze some interesting bits from it, 10 years old as it is (at least the pieces I kept are).