Clarify whether presentational children contribute to text equivalents

Re: http://www.w3.org/WAI.new/PF/aria/complete#namecalculation

Please clarify whether presentational children contribute to text equivalent calculation. In particular, does role="presentation" affect "host language … mechanisms" for associating labels with elements?

For example, given this markup:

   <div role="button"><img role="presentation" alt="Edit" src="pencil.png"></div>

Should the accessible name of the button be "Edit" or ""?

See also the discussion in this thread on public-html-a11y:

http://lists.w3.org/Archives/Public/public-html-a11y/2010Sep/0349.html

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Benjamin Hawkes-Lewis