What does the number in the Repository file "format" represent ?

[Phil Pinkerton]

How can we determine what version of Subversion a Repository currently is.

5 =  1.4 ?  or 1.5 ?

Need to wire a script to check for older versions as we upgraded the FSFS 
server from 1.4.x to 1.5.x then 1.6.x 

phil