[Accessibility-ia2] IAccessibleValue for unknown values

[Pete Brunet]

Today we have for current value (and need to add to min/max) the following::

VT_I4 of 0
NULL for nothing to return.

It seems like "nothing to return" could be used for unknown and
indeterminate so I need to understand what the difference between:
    nothing to return, unknown, and indeterminate
before we talk about adding more means of signalling.
-- 
*Pete Brunet*
                                                                
a11ysoft - Accessibility Architecture and Development
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David Bolter wrote:
>  Hi all,
>
> What is recommended when a particular value is unknown? For example, a
> spinner might not have a known maximum value (indeterminate). What
> should be exposed via IAccessibleValue::maximumValue for this case?
>
> Note it would be nice to differentiate between indeterminate, unknown,
> and 0.
>
> cheers,
> David
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