ARIA Progress bars

[Jacob Farber]

Hi Everyone,
I've been putting together some specs for semantic progress bars, 
specifically for the Uploader. I've been trying to wrap my head around 
the ARIA specs re: this patricular live region, and this is what I got 
as a starting point (as outlined in the JIRA key FLUID-983)

Static attributes:
• role = progressbar
• valuemax = 100
• valuemin = 0
• live = assertive

Dynamic attributes:
• valuenow (number)
• busy (boolean)

So far, we've had some good JAWS feedback in FF as it reads out the 
valuenow attribute appropriately, but what I was wondering is can we put 
an actual phrase in the attribute? 
(http://www.w3.org/TR/2008/WD-wai-aria-20080204/#valuenow says no, but 
is this for certain?)
Jacob