# File lib/edi4r.rb, line 230
    def inspect( indent='', symlist=[] )
      headline = indent + self.name+': ' + symlist.map do |sym|
        "#{sym} = #{(s=send(sym)).nil? ? 'nil' : s.to_s}"
      end.join(', ') + "\n"
      headline << @header.inspect(indent+'  ') if @header
      s = @a.inject( headline ){|s,obj| s << obj.inspect(indent+'  ')}
      @trailer ? s << @trailer.inspect(indent+'  ') : s
    end