[igraph] reading graph from files ??

[alex]

Hi
my problem is that i want to store a graph genrated randomly (i use the 
grg game) by wirting to external file (i tried the graphML) and so i can 
use the same graph in the future. But i found that i can't get the 
coordinates of vertex when i read the graph from files. How can i do it ?
Thx for help.