Thank you very much. With your proposal the intended usages of a named procedure becomes possible. It is a pity that the help page does not give an appropriate explanation. The current example with 'color=proc(x,y) x*y end proc' is of limited usefulness.

Thank you very much. Your answer not only solves my problem very smartly (especially the unusual application of the function operator in the last alternative), but with the concept of delayed evaluation I also learnt a feature I can immediately use profitably at another place of my Maple program.