15. The system of claim 14 , wherein the two or more alternative constraints are based on two or more alternative interpretations of a word derived from the user request.
15. The system of claim 14 , wherein the two or more alternative constraints are based on two or more alternative interpretations of a word derived from the user request. 16. The system of claim 15 , wherein two or more alternative interpretations of the word associate the word with a name constraint and a category constraint for a constrained selection task.