# File lib/vpim/vcard.rb, line 602
    def lines(name=nil) #:yield: Line
      # FIXME - this would be much easier if #lines was #each, and there was a
      # different #lines that returned an Enumerator that used #each
      unless block_given?
        map do |f|
          if( !name || f.name?(name) )
           f2l(f)
          else
            nil
          end
        end.compact
      else
        each do |f|
          if( !name || f.name?(name) )
            line = f2l(f)
            if line
              yield line
            end
          end
        end
        self
      end
    end