Yes but that puts a limit on levels as I am sure the lengt of the key has some limitations.
Thanks
Peter

Another way, would be to trace the geneology through each node nod key assignment. For example:
>

> #  PID    CID  n Pstr   Cstr
> 9  2546  2545  1 TEST5  TEST4
>10  2545     6  2 TEST4  ACYT1L
>11  2545  1291  2 TEST4	 ACYT4L
>12  2545  2542  2 TEST4  zzTEST
>13  2542    64  3 zzTEST BPGA5V
>14    64    46  4 BPGA5V APHOT
>15    46    33  5 APHOT  AMYO4V
>16    46    35  5 APHOT  ANUR1L
>
>_2546
>     _2546_2545
>          _2546_2545_0006
>          _2546_2545_1291
>          _2546_2545_2542
>               _2546_2545_2542_0064
>                    _2546_2545_2542_0064_0046
>                         _2546_2545_2542_0064_0046_0033
>                         _2546_2545_2542_0064_0046_0035
>

>An advantage of explicit keys is that you can point to the node or use table fields conbinations to point to a node.