def trim_punctuation
      lambda do |rec, accumulator|
        accumulator.collect! {|s| Marc21.trim_punctuation(s)}
      end
    end
def trim_punctuation
      lambda do |rec, accumulator|
        accumulator.collect! {|s| Marc21.trim_punctuation(s)}
      end
    end
A transformation macro version of trim_punctuation -- heuristics for trimming punctuation
 from AACR2/MARC style values, to get bare values.