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From the September 29 meeting: http://www.w3.org/2009/09/29-aapi-minutes.html In order to determine if IDREF/IDREFS error handling can be moved to the Relations section, I checked the WAI-ARIA spec to determine which aria properties use IDREF/IDREFS. It's the relations properties and aria-activedescendant.
Converted IDREF/IDREFS error handling from FAQ format to prose. Moved to section in 4.6.3 Relations. Referenced from aria-activedescendent row of state/property mapping table.