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We currently define both http://www.w3.org/2005/xpath-functions/map and http://www.w3.org/2011/xpath-functions/map. I have changed the text to use http://www.w3.org/2005/xpath-functions/map so that at least it is consistent, but we need to make a final choice at some time.
Resolved that we are using the /2005/ namespace for the time being, though this could change before we reach Rec status as a result of liaison with XQuery WG.