par Brian Yare.
Keith I think that you are confused here.
A full version id is a series of numbers separated by dots. The most important number is at the left.
If you break it down in this way you will know that e.g. 1.9.10 is more recent than 1.9.9, and 2.5.1 is more recent than 2.4.2.
The dots are VERY important. They are NOT to be read as decimal points.
Brian