role, state, value

I have drafted a first cut at a mapping document for 508 1194.22 to WCAG 2 WD.

The hardest part was differentiating between 4.2.3 - 4.2.6.  The Understanding Wcag2 document is help, but these four still seem somewhat arbitrary and overlapping.  Can anyone point me to other resources or discussion of this topic in the list archives?

One mistake was not explicitly including 1194.21, but I won't be able to take a second serious draft at this for a week or two.

Thanks.