Java HotSpot Virtual Machine

K, I'm confused. I'm seeing what I believe to be two different definitions of how to calcuate total java heap memory. My specific confusion is the relationship between the -Xmx and MaxPermSize switches.

1) Is MaxPermSize seperate from mx - outside of what mx defines?
2) Is MaxPermSize taken "from" mx?

Tim Cramer says #1
"Tuning Garbage Collection with Java 1.3.1" says #2

First, interview with TimCramer:

http://developer.java.sun.com/developer/community/chat/JavaLive/2001/jl0327.html

At the very end of the interview he says:

TimCramer: For 1.3 here's the formula:
TotalHeapSize = -Xmx setting + MaxPermSize
The heap is further divided into Young and Old generation: -XX:MaxNewSize is taken from the -Xmx setting, thus, - Xmx1024m -XX:NewSize=256m -XX:MaxPermSize=32m yields a 1056m heap, with 768m in the old and 256 in the new generation.

Then there is:

http://java.sun.com/docs/hotspot/gc/index.html

In the "Sizing Generations" section, it graphically shows MaxPerSize is taken from what mx defines.