# File rlml.rb, line 425
    def start_tag(name)
      unless name =~ /^[A-Za-z_]\w*(.?[A-Za-z_]\w*)*$/ && name.size < 1024
        raise WriteError, "Invalid name: `#{name}'"
      end
      @depth += 1
      emit_required_whitespace
      super
    end