# File lib/rgen/metamodel_builder/data_types.rb, line 43
          def literals_as_strings
               literals.collect do |l|
                       if l.is_a?(Symbol)
          if l.to_s =~ /^\d|\W/
            ":'"+l.to_s+"'"
          else
            ":"+l.to_s
          end
                       elsif l.is_a?(TrueClass) || l.is_a?(FalseClass)
                               l.to_s
                       else
                               raise StandardError.new("Literal values can only be symbols or true/false")
                       end
               end
          end