recursive subroutine HstNmlInfoAdd( gthstnml, name, file, interval_value, interval_unit, precision, average, fileprefix, err )
    !
    ! 変数の出力情報を加えます. 
    !
    ! デフォルト値を設定するには, *name* を与えないか, または
    ! *name* に空白を与えてください. 
    ! デフォルト値を与える場合, *file* に与えられる情報は無視されます. 
    ! *fileprefix* はデフォルト値に与える場合のみ有効です. 
    !
    ! *name* に変数名が指定され, その際に *file* が与えられない, 
    ! または空白が与えられる場合, *file* には 
    ! "<i><*name* に与えられた文字></i>.nc" が指定されます. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, プログラムはエラーを発生させます. 
    !
    ! Add output information of a variable.
    ! 
    ! In order to set default values, specify blank to *name* or
    ! do not specify *name*.
    ! When default values are specified, *file* is ignored. 
    ! *fileprefix* is valid only when default values are specified. 
    !
    ! When a variable identifier is specified to *name* and 
    ! *file* is not specified or blanks are specified to *file*,
    ! "<i><string given to *name*></i>.nc" is specified to *file*.
    !
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_trace, only: BeginSub, EndSub, DbgMessage
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_present, only: present_and_not_empty, present_and_true, present_select
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_date_types, only: DC_DIFFTIME
    use dc_date, only: DCDiffTimeCreate
    use dc_message, only: MessageNotify
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, DC_EARGLACK, USR_ERRNO, HST_ENOTINDEFINE
    implicit none
    type(GTHST_NMLINFO), intent(inout):: gthstnml
    character(*), intent(in), optional:: name
                              ! 変数名. 
                              ! 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! "Data1,Data2" のようにカンマで区切って複数
                              ! の変数を指定することも可能です. 
                              !
                              ! 
                              ! Variable identifier. 
                              ! 
                              ! Blanks at the head of the name are ignored. 
                              ! 
                              ! Multiple variables can be specified 
                              ! as "Data1,Data2" too. Delimiter is comma. 
                              !
                              ! 
    character(*), intent(in), optional:: file
                              ! ヒストリデータのファイル名. 
                              ! History data filenames
    real, intent(in), optional:: interval_value
                              ! ヒストリデータの出力間隔の数値. 
                              ! 負の値を与えると, 出力を抑止します. 
                              ! 
                              ! Numerical value for interval of history data output. 
                              ! Negative values suppresses output.
    character(*), intent(in), optional:: interval_unit
                              ! ヒストリデータの出力間隔の単位. 
                              ! Unit for interval of history data output
    character(*), intent(in), optional:: precision
                              ! ヒストリデータの精度. 
                              ! Precision of history data
    logical, intent(in), optional:: average
                              ! 出力データの平均化フラグ. 
                              ! Flag for average of output data.
    character(*), intent(in), optional:: fileprefix
                              ! ヒストリデータのファイル名の接頭詞. 
                              ! Prefixes of history data filenames
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr_last =>null()
    type(DC_DIFFTIME):: interval_time
    character(TOKEN), pointer:: varnames_array(:) =>null()
    integer:: i, vnmax
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoAdd'
  continue
    call BeginSub( subname, fmt = '@name=%a @file=%a @interval_value=%r @interval_unit=%a @precision=%a @average=%y @fileprefix=%a', r  = (/ present_select(.true., -1.0, interval_value) /), l  = (/ present_and_true(average) /), ca = StoA( present_select(.true., '<no>', name), present_select(.true., '<no>', file), present_select(.true., '<no>', interval_unit), present_select(.true., '<no>', precision), present_select(.true., '<no>', fileprefix) ) )

    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    if ( .not. gthstnml % define_mode ) then
      stat = HST_ENOTINDEFINE
      cause_c = 'Add'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  複数の変数を設定する場合
    !  Configure multiple variables
    !-----------------------------------------------------------------
    if ( present_and_not_empty(name) ) then
      if ( index(name, ',') > 0 ) then
        call DbgMessage( 'multiple entries (%c) will be created', c1 = trim(name) )
!!$        if ( present(file) ) call DbgMessage( 'argument @file=%c is ignored', c1 = trim(file) )

        call Split( str = name, sep = ',', carray = varnames_array )        ! (out)
        vnmax = size( varnames_array )

        do i = 1, vnmax
          call HstNmlInfoAdd( gthstnml = gthstnml, name = varnames_array(i), file = file, interval_value = interval_value, interval_unit = interval_unit, precision = precision, average = average, err = err )                        ! (out)
          if ( present_and_true( err ) ) then
            deallocate( varnames_array )
            stat = USR_ERRNO
            goto 999
          end if
        end do
        deallocate( varnames_array )
        goto 999
      end if
    end if

    !-----------------------------------------------------------------
    !  *gthstnml* へ情報を追加.
    !  Add information to *gthstnml*
    !-----------------------------------------------------------------
    if ( .not. present_and_not_empty(name) ) then
      if ( present(interval_value) ) gthstnml % gthstnml_list % interval_value = interval_value
      if ( present(interval_unit)  ) gthstnml % gthstnml_list % interval_unit  = interval_unit 
      if ( present(precision)      ) gthstnml % gthstnml_list % precision      = precision     
      if ( present(average)        ) gthstnml % gthstnml_list % average        = average       
      if ( present(fileprefix)     ) gthstnml % gthstnml_list % fileprefix     = fileprefix    

      hptr => gthstnml % gthstnml_list

    else
      hptr => gthstnml % gthstnml_list
      call ListSearch( gthstnml_list = hptr, name = name )           ! (in)
      if ( .not. associated(hptr) ) then
        call DbgMessage( 'new entry (%c) is created', c1 = trim( adjustl( name ) ) )

        hptr_last => gthstnml % gthstnml_list
        call ListLast( gthstnml_list = hptr_last ) ! (inout)
        allocate( hptr )

        nullify( hptr % next )

        hptr % interval_value => gthstnml % gthstnml_list % interval_value 
        hptr % interval_unit  => gthstnml % gthstnml_list % interval_unit  
        hptr % precision      => gthstnml % gthstnml_list % precision      
        hptr % average        => gthstnml % gthstnml_list % average        
        hptr % fileprefix     => gthstnml % gthstnml_list % fileprefix     

        hptr_last % next => hptr
      else
        call DbgMessage( 'entry (%c) is overwritten', c1 = trim( adjustl( name ) ) )
      end if

      hptr % name  = adjustl( name )
      if ( present_and_not_empty(file) ) then
        hptr % file = file
        nullify(  hptr % fileprefix )
        allocate( hptr % fileprefix )
        hptr % fileprefix = ''
      else
        hptr % file = trim( adjustl(name ) ) // '.nc'
      end if

      if ( present(interval_value) ) then
        nullify(  hptr % interval_value )
        allocate( hptr % interval_value )
        hptr % interval_value = interval_value 
      end if
      if ( present(interval_unit)  ) then
        nullify(  hptr % interval_unit  )
        allocate( hptr % interval_unit  )
        hptr % interval_unit  = interval_unit  
      end if
      if ( present(precision)      ) then
        nullify(  hptr % precision      )
        allocate( hptr % precision      )
        hptr % precision      = precision      
      end if
      if ( present(average)        ) then
        nullify(  hptr % average        )
        allocate( hptr % average        )
        hptr % average        = average        
      end if

    end if

    !---------------------------------------------------------------
    !  時間の単位のチェック
    !  Check unit of time
    !---------------------------------------------------------------
    call DCDiffTimeCreate( diff = interval_time, value = real( hptr % interval_value, DP ), unit = hptr % interval_unit, err = err )                                  ! (out)
    if ( present_and_true( err ) ) then
      call HstNmlInfoDelete( gthstnml = gthstnml, name = name )          ! (in)
      stat = USR_ERRNO
      goto 999
    end if

    nullify( hptr )

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoAdd

  subroutine HstNmlInfoAssocGtHist( gthstnml, name, history, err )
    !
    ! 与えられた gt4_history#GT_HISTORY 型のポインタ *history* に対し, 
    ! *gthstnml* 内の *name* に関する gt4_history#GT_HISTORY 型変数を
    ! 結合します. 
    ! 空状態の *history* を与えてください. 
    !
    ! HstNmlInfoEndDefine で定義モードから出力モードに
    ! 移行した後に呼び出してください. 
    ! HstNmlInfoEndDefine を呼ぶ前にこのサブルーチンを使用すると, 
    ! プログラムはエラーを発生させます. 
    !
    ! *name* に関する情報が見当たらない場合, 
    ! プログラムはエラーを発生させます. 
    ! *name* が空文字の場合にも, 
    ! プログラムはエラーを発生させます. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合にも, プログラムはエラーを発生させます. 
    !
    ! This subroutine associates given "gt4_history#GT_HISTORY" 
    ! pointer *history* to 
    ! "gt4_history#GT_HISTORY" correspond to *name* in *gthstnml*. 
    ! Give null *history*. 
    !
    ! Use after state is changed from define mode to
    ! output mode by "HstNmlInfoEndDefine". 
    ! If this subroutine is used before 
    ! "HstNmlInfoEndDefine" is used, error is occurred. 
    !
    ! When data correspond to *name* is not found, 
    ! error is occurred.
    ! When *name* is blank, 
    ! error is occurred too.
    ! 
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, DC_ENOENTRY, HST_EBADNAME, HST_EINDEFINE
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
    character(*), intent(in):: name
                              ! 変数名. 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! Variable identifier. 
                              ! Blanks at the head of the name are ignored. 
    type(GT_HISTORY), pointer:: history
                              ! (out)
                              ! 
                              ! gt4_history モジュール用構造体. 
                              ! Derived type for "gt4_history" module
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoAssocGtHist'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    if ( trim( name ) == '' ) then
      stat = HST_EBADNAME
      cause_c = ''
      goto 999
    end if

    if ( gthstnml % define_mode ) then
      stat = HST_EINDEFINE
      cause_c = 'AssocGtHist'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  *gthstnml* 内から, *name* に関する history を探査.
    !  Search "history" correspond to *name* in *gthstnml*
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    call ListSearch( gthstnml_list = hptr, name = name )           ! (in)

    if ( .not. associated( hptr ) ) then
      stat = DC_ENOENTRY
      cause_c = adjustl( name )
      goto 999
    end if

    nullify( history )
    history => hptr % history

    nullify( hptr )

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoAssocGtHist

  subroutine HstNmlInfoClose( gthstnml, err )
    !
    ! GTHST_NMLINFO 型の変数の終了処理を行います. 
    !
    ! このサブルーチンを使用する前に, *gthstnml* に格納されている
    ! gt4_history#GT_HISTORY 型の全ての変数に対して, 
    ! gt4_history#HistoryClose を用いて終了処理を行ってください. 
    ! 終了処理されていないものがある場合, 
    ! プログラムはエラーを発生させます. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, プログラムはエラーを発生させます. 
    !
    ! Deconstructor of "GTHST_NMLINFO". 
    !
    ! Terminate all "gt4_history#GT_HISTORY" variables in *gthstnml*
    ! by "gt4_history#HistoryClose" before this subroutine is used. 
    ! If unterminated variables remain, 
    ! error is occurred. 
    !
    ! Note that if *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred. 
    !
    use dc_trace, only: BeginSub, EndSub, DbgMessage
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, HST_ENOTTERMGTHIST
    use gt4_history, only: HistoryInitialized
    implicit none
    type(GTHST_NMLINFO), intent(inout):: gthstnml
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr_prev =>null()
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoClose'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  "GTHST_NMLINFO" の設定の消去
    !  Clear the settings for "GTHST_NMLINFO"
    !-----------------------------------------------------------------
    do 
      hptr => gthstnml % gthstnml_list
      call ListLast( gthstnml_list = hptr, previous = hptr_prev )             ! (out)
      call DbgMessage( 'remove entry (%c)', c1 = trim(hptr % name) )
      if ( trim( hptr % name ) == '' ) exit
      if ( .not. gthstnml % define_mode ) then
        if ( HistoryInitialized( hptr % history ) ) then
          stat = HST_ENOTTERMGTHIST
          cause_c = hptr % name
          goto 999
        end if
      end if
      deallocate( hptr )
      nullify( hptr_prev % next )
    end do
    deallocate( gthstnml % gthstnml_list )

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
    gthstnml % initialized = .false.
    gthstnml % define_mode = .true.
999 continue
    nullify( hptr )
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoClose

  subroutine HstNmlInfoCreate( gthstnml, interval_value, interval_unit, precision, average, fileprefix, err )
    !
    ! GTHST_NMLINFO 型の変数の初期設定を行います. 
    ! 他のサブルーチンを使用する前に必ずこのサブルーチンによって 
    ! GTHST_NMLINFO 型の変数を初期設定してください. 
    !
    ! *interval_value*, 
    ! *interval_unit*, 
    ! *precision*, 
    ! *average*
    ! はデフォルト値として設定されます. 
    ! *fileprefix* は各変数の出力ファイル名の接頭詞として
    ! 使用されます. 
    !
    ! なお, 与えられた *gthstnml* が既に初期設定されている場合, 
    ! プログラムはエラーを発生させます. 
    !
    ! Constructor of "GTHST_NMLINFO". 
    ! Initialize *gthstnml* by this subroutine, 
    ! before other procedures are used, 
    !
    ! *interval_value*, 
    ! *interval_unit*, 
    ! *precision*, 
    ! *average* 
    ! are set as default values. 
    ! *fileprefix* is used as prefixes of output filenames of 
    ! each variable. 
    !
    ! Note that if *gthstnml* is already initialized 
    ! by this procedure, error is occurred. 
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_present, only: present_and_not_empty, present_and_true, present_select
    use dc_message, only: MessageNotify
    use dc_error, only: StoreError, DC_NOERR, DC_EALREADYINIT, DC_EARGLACK, DC_ENEGATIVE, DC_ENOFILEREAD, USR_ERRNO
    use dc_date_types, only: DC_DIFFTIME
    use dc_date, only: DCDiffTimeCreate
    implicit none
    type(GTHST_NMLINFO), intent(inout):: gthstnml
    real, intent(in), optional:: interval_value
                              ! ヒストリデータの出力間隔の数値. 
                              ! 負の値を与えると, 出力を抑止します. 
                              ! 
                              ! Numerical value for interval of history data output. 
                              ! Negative values suppresses output.
    character(*), intent(in), optional:: interval_unit
                              ! ヒストリデータの出力間隔の単位. 
                              ! Unit for interval of history data output
    character(*), intent(in), optional:: precision
                              ! ヒストリデータの精度. 
                              ! Precision of history data
    logical, intent(in), optional:: average
                              ! 出力データの平均化フラグ. 
                              ! Flag for average of output data.
    character(*), intent(in), optional:: fileprefix
                              ! ヒストリデータのファイル名の接頭詞. 
                              ! Prefixes of history data filenames
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(DC_DIFFTIME):: interval_time
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoCreate'
  continue
    call BeginSub( subname, fmt = '@interval_value=%r @interval_unit=%c @precision=%c @average=%y @fileprefix=%c', r  = (/ present_select(.true., -1.0, interval_value) /), c1 = trim( present_select(.true., '<no>', interval_unit) ), c2 = trim( present_select(.true., '<no>', precision) ), l  = (/ present_and_true(average) /), c3 = trim( present_select(.true., '<no>', fileprefix) ), version = version )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( gthstnml % initialized ) then
      stat = DC_EALREADYINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  割付
    !  Allocate
    !-----------------------------------------------------------------
    allocate( gthstnml % gthstnml_list )
    nullify( gthstnml % gthstnml_list % next )

    !-----------------------------------------------------------------
    !  デフォルト値の設定
    !  Configure default values
    !-----------------------------------------------------------------
    gthstnml % gthstnml_list % name = ''
    gthstnml % gthstnml_list % file = ''

    allocate( gthstnml % gthstnml_list % interval_value )
    allocate( gthstnml % gthstnml_list % interval_unit  )
    allocate( gthstnml % gthstnml_list % precision      )
    allocate( gthstnml % gthstnml_list % average        )
    allocate( gthstnml % gthstnml_list % fileprefix    )
    gthstnml % gthstnml_list % interval_value = -1.0
    gthstnml % gthstnml_list % interval_unit  = 'sec'
    gthstnml % gthstnml_list % precision      = 'float'
    gthstnml % gthstnml_list % average        = .false.
    gthstnml % gthstnml_list % fileprefix     = ''

    if ( present(interval_value) ) gthstnml % gthstnml_list % interval_value = interval_value
    if ( present(interval_unit)  ) gthstnml % gthstnml_list % interval_unit  = interval_unit 
    if ( present(precision)      ) gthstnml % gthstnml_list % precision      = precision     

    if ( present(average)        ) gthstnml % gthstnml_list % average        = average       
    if ( present(fileprefix)     ) gthstnml % gthstnml_list % fileprefix     = fileprefix    

    !-----------------------------------------------------------------
    !  時間の単位のチェック
    !  Check unit of time
    !-----------------------------------------------------------------
    call DCDiffTimeCreate( diff = interval_time, value = real( gthstnml % gthstnml_list % interval_value, DP ), unit = gthstnml % gthstnml_list % interval_unit, err = err )                                                ! (out)
    if ( present_and_true( err ) ) then
      stat = USR_ERRNO
      goto 999
    end if

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
    gthstnml % initialized = .true.
    gthstnml % define_mode = .true.
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoCreate

  logical function HstNmlInfoDefineMode( gthstnml ) result(result)
    !
    ! *gthstnml* が定義モードであれば .true. が, 
    ! 定義モードでなければ .false. が返ります. 
    !
    ! If *gthstnml* is define mode, .true. is returned. 
    ! If *gthstnml* is not define mode, .false. is returned. 
    !
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
  continue
    result = gthstnml % define_mode
  end function HstNmlInfoDefineMode

  recursive subroutine HstNmlInfoDelete( gthstnml, name, err )
    !
    ! 変数の出力情報を削除します. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, プログラムはエラーを発生させます. 
    !
    ! Delete output information of a variable.
    ! 
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_trace, only: BeginSub, EndSub, DbgMessage
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_present, only: present_and_not_empty, present_and_true
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, DC_EARGLACK, USR_ERRNO, HST_ENOTINDEFINE
    implicit none
    type(GTHST_NMLINFO), intent(inout):: gthstnml
    character(*), intent(in):: name
                              ! 変数名. 
                              ! 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! "Data1,Data2" のようにカンマで区切って複数
                              ! の変数を指定することが可能です. 
                              ! 
                              ! Variable identifier. 
                              ! 
                              ! Blanks at the head of the name are ignored. 
                              ! 
                              ! Multiple variables can be specified 
                              ! as "Data1,Data2". Delimiter is comma. 
                              ! 
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr_prev =>null()
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr_next =>null()
    character(TOKEN), pointer:: varnames_array(:) =>null()
    integer:: i, vnmax
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoDelete'
  continue
    call BeginSub( subname, fmt = '@name=%c', c1 = trim( name ) )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    if ( .not. gthstnml % define_mode ) then
      stat = HST_ENOTINDEFINE
      cause_c = 'Delete'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  複数の変数を削除する場合
    !  Delete multiple variables
    !-----------------------------------------------------------------
    if ( present_and_not_empty(name) ) then
      if ( index(name, ',') > 0 ) then
        call DbgMessage( 'multiple entries (%c) will be deleted', c1 = trim(name) )
        call Split( str = name, sep = ',', carray = varnames_array )        ! (out)
        vnmax = size( varnames_array )

        do i = 1, vnmax
          call HstNmlInfoDelete( gthstnml = gthstnml, name = varnames_array(i), err = err )                 ! (out)
          if ( present_and_true( err ) ) then
            deallocate( varnames_array )
            stat = USR_ERRNO
            goto 999
          end if
        end do
        deallocate( varnames_array )
        goto 999
      end if
    end if

    !-----------------------------------------------------------------
    !  *gthstnml* の情報を削除.
    !  Delete information in *gthstnml*
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    call ListSearch( gthstnml_list = hptr, name = name, previous = hptr_prev, next = hptr_next )      ! (out)

    if ( .not. associated( hptr ) ) goto 999
    if ( ( trim(hptr % name) /= '' ) .and. associated( hptr_prev ) ) then
      call DbgMessage( 'entry (%c) is deleted', c1 = trim( adjustl( name ) ) )
      hptr_prev % next => hptr_next
      deallocate( hptr )
    end if

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoDelete

  subroutine HstNmlInfoEndDefine( gthstnml, err )
    !
    ! 定義モードから出力モードに移行し, 
    ! *gthstnml* に設定した情報を確定します. 
    ! HstNmlInfoAssocGTHist サブルーチンを呼び出す前に, 
    ! 必ずこのサブルーチンを呼び出してください. 
    ! このサブルーチンを呼んだ後に 
    ! HstNmlInfoAdd, HstNmlInfoDelete, HstNmlInfoResetDefault 
    ! を呼ぶとプログラムはエラーを発生させます. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合にも, プログラムはエラーを発生させます. 
    !
    ! Change from define mode to output mode, 
    ! and determine information configured in *gthstnml*. 
    ! Use this subroutine before "HstNmlInfoAssocGTHist" is used. 
    ! If "HstNmlInfoAdd", "HstNmlInfoDelete", "HstNmlInfoResetDefault" 
    ! are used after 
    ! this subroutine is used, error is occurred. 
    !
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_hash, only: HASH, DCHashPut, DCHashGet, DCHashRewind, DCHashNext, DCHashNumber
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, HST_ENOTINDEFINE, HST_EINTFILE
    use dc_message, only: MessageNotify
    implicit none
    type(GTHST_NMLINFO), intent(inout):: gthstnml
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  ファイルの重複をチェックするための変数
    !  Variables for checking duplication of files
    type(HASH):: opened_files
    character(STRING):: opname, opfile
    logical:: end

    !-----------------------------------
    !  作業変数
    !  Work variables
    character(STRING):: fullfilename
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr_prev =>null()
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoEndDefine'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    if ( .not. gthstnml % define_mode ) then
      stat = HST_ENOTINDEFINE
      cause_c = 'EndDefine'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  gt4_history#GT_HISTORY 変数の割付
    !  Allocate "gt4_history#GT_HISTORY" variables
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    allocate( hptr % history )
    WholeLoop : do while ( associated( hptr % next ) )
      call ListNext( gthstnml_list = hptr ) ! (inout)
      if ( trim(hptr % name) == '' .or. trim(hptr % file) == '' ) cycle WholeLoop

      fullfilename = trim( hptr % fileprefix ) // hptr % file

      !---------------------------------------------------------------
      !  以前に同一ファイル名の gt4_history#GT_HISTORY 変数がある場合, そちらに結合
      !  If "gt4_history#GT_HISTORY" that has same filename exist already, associate to it
      !---------------------------------------------------------------
      nullify( hptr_prev )
      call DCHashRewind(opened_files) ! (inout)
      SearchLoop : do
        call DCHashNext( opened_files, opname, opfile, end )  ! (out)
        if ( end ) exit SearchLoop
        if ( trim(opfile) /= trim(fullfilename) ) cycle SearchLoop
        hptr_prev => gthstnml % gthstnml_list
        call ListSearch( gthstnml_list = hptr_prev, name = opname )              ! (in)
        if ( .not. associated( hptr_prev ) ) cycle SearchLoop
        !
        ! interval_value, interval_unit の同一性をチェック
        ! Check consistency of "interval_value", "interval_unit"
        !
        if ( hptr % interval_value /= hptr_prev % interval_value ) then
          call MessageNotify( 'W', subname, '@interval_value=%r (var=%a) and @interval_value=%r (var=%a) are applied to a file "%a"', r = (/hptr % interval_value, hptr_prev % interval_value/), ca = StoA(hptr % name, hptr_prev % name, fullfilename) )
          stat = HST_EINTFILE
          cause_c = fullfilename
          goto 999
        elseif ( hptr % interval_unit /= hptr_prev % interval_unit ) then
          call MessageNotify( 'W', subname, '@interval_unit=%a (var=%a) and @interval_unit=%a (var=%a) are applied to a file "%a"', ca = StoA(hptr % interval_unit, hptr % name, hptr_prev % interval_unit, hptr_prev % name, fullfilename) )
          stat = HST_EINTFILE
          cause_c = fullfilename
          goto 999
        end if
        hptr % history => hptr_prev % history
        exit SearchLoop
      end do SearchLoop

      !---------------------------------------------------------------
      !  新規に割付
      !  Allocate newly
      !---------------------------------------------------------------
      if ( .not. associated( hptr % history ) ) then
        allocate( hptr % history )
      end if

      !---------------------------------------------------------------
      !  割り付けられた名前とファイル名を登録
      !  Regist allocated name and filename
      !---------------------------------------------------------------
      call DCHashPut( opened_files, hptr % name, fullfilename ) ! (in)

    end do WholeLoop

    nullify( hptr )
    nullify( hptr_prev )

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
    gthstnml % define_mode = .false.
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoEndDefine

  logical function HstNmlInfoInitialized( gthstnml ) result(result)
    !
    ! *gthstnml* が初期設定されている場合には .true. が, 
    ! 初期設定されていない場合には .false. が返ります. 
    !
    ! If *gthstnml* is initialized, .true. is returned. 
    ! If *gthstnml* is not initialized, .false. is returned. 
    !
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
  continue
    result = gthstnml % initialized
  end function HstNmlInfoInitialized

  subroutine HstNmlInfoInquire( gthstnml, name, file, interval_value, interval_unit, precision, average, fileprefix, err )
    !
    ! 変数の出力情報を取得します. 
    !
    ! デフォルト値を取得するには, *name* を与えないか, または
    ! *name* に空白を与えてください. 
    !
    ! *name* に関するデータが存在しない場合, エラーを発生させます. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, プログラムはエラーを発生させます. 
    !
    ! Inquire output information of a variable.
    ! 
    ! If data correspond to *name* is not found, 
    ! error is occurred. 
    !
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_present, only: present_and_not_empty, present_and_true
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, DC_EARGLACK, DC_ENOENTRY
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
    character(*), intent(in), optional:: name
                              ! 変数名. 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! Variable identifier. 
                              ! Blanks at the head of the name are ignored. 
    character(*), intent(out), optional:: file
                              ! ヒストリデータのファイル名. 
                              ! History data filenames
    real, intent(out), optional:: interval_value
                              ! ヒストリデータの出力間隔の数値. 
                              ! 負の値を与えると, 出力を抑止します. 
                              ! 
                              ! Numerical value for interval of history data output. 
                              ! Negative values suppresses output.
    character(*), intent(out), optional:: interval_unit
                              ! ヒストリデータの出力間隔の単位. 
                              ! Unit for interval of history data output
    character(*), intent(out), optional:: precision
                              ! ヒストリデータの精度. 
                              ! Precision of history data
    logical, intent(out), optional:: average
                              ! 出力データの平均化フラグ. 
                              ! Flag for average of output data.
    character(*), intent(out), optional:: fileprefix
                              ! ヒストリデータのファイル名の接頭詞. 
                              ! Prefixes of history data filenames

    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoInquire'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  *gthstnml* 内から, *name* に関する情報を探査.
    !  Search information correspond to *name* in *gthstnml*
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    call ListSearch( gthstnml_list = hptr, name = name )           ! (in)

    if ( .not. associated( hptr ) ) then
      stat = DC_ENOENTRY
      cause_c = adjustl( name )
      goto 999
    end if

    if ( hptr % name == '' ) then
      if ( present(file)           ) file           = ''
    else
      if ( present(file)           ) file           = trim( hptr % fileprefix ) // hptr % file
    end if
    if ( present(interval_value) ) interval_value = hptr % interval_value
    if ( present(interval_unit)  ) interval_unit  = hptr % interval_unit 
    if ( present(precision)      ) precision      = hptr % precision     
    if ( present(average)        ) average        = hptr % average       
    if ( present(fileprefix)     ) fileprefix     = hptr % fileprefix    

    nullify( hptr )

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoInquire

  character(STRING) function HstNmlInfoNames( gthstnml ) result(result)
    !
    ! *gthstnml* が設定されている変数リストをカンマでつなげて
    ! 返します. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, 空文字が返ります. 
    !
    ! List of variables registered in *gthstnml* is join with ',', 
    ! and returned. 
    ! 
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! blank is returned. 
    !
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    logical:: first
!!$    character(*), parameter:: subname = 'HstNmlInfoNames'
  continue

    result = ''
    first = .true.

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) goto 999

    !-----------------------------------------------------------------
    !  情報の取り出し
    !  Fetch information
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    do while ( associated( hptr % next ) )
      call ListNext( gthstnml_list = hptr ) ! (inout)
      if ( first ) then
        result = adjustl( hptr % name )
        first = .false.
      else
        result = trim( result ) // ',' // adjustl( hptr % name )
      end if
    end do

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    nullify( hptr )
  end function HstNmlInfoNames

  logical function HstNmlInfoOutputStep( gthstnml, name, time ) result(result)
    !
    ! *time* が変数 *name* の出力されるタイミングであれば
    ! .true. を, そうでなければ .false. を返します. 
    ! *gthstnml* が初期設定されていない場合にも .false. が返ります. 
    ! *name* に関するデータが存在しない場合にも .false. が返ります. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, プログラムはエラーを発生させます. 
    !
    ! If *time* is the time that a variable *name* is output,
    ! .true. is returned, otherwise .false. is returned
    ! When *gthstnml* is not initialized, .false. is returned too.
    ! When data correspond to *name* is not found, .false. is returned too.
    ! 
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_present, only: present_and_not_empty, present_and_true
    use dc_date_types, only: DC_DIFFTIME
    use dc_date, only: DCDiffTimeCreate, mod, operator(==), toChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
    character(*), intent(in):: name
                              ! 変数名. 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! Variable identifier. 
                              ! Blanks at the head of the name are ignored. 
    type(DC_DIFFTIME), intent(in):: time
                              ! 現在時刻. Current time

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    type(DC_DIFFTIME):: interval_time
!!$    character(*), parameter:: subname = 'HstNmlInfoOutputStep'
  continue

    result = .false.

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) goto 999

    !-----------------------------------------------------------------
    !  情報格納変数への結合
    !  Associate a variable storing information
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    call ListSearch( gthstnml_list = hptr, name = name )           ! (in)

    if ( .not. associated( hptr ) ) goto 999
    if ( hptr % output_step_disable ) goto 999

    !-----------------------------------------------------------------
    !  時刻のチェック
    !  Check time
    !-----------------------------------------------------------------
    if ( .not. hptr % interval_value > 0.0 ) goto 999

    call DCDiffTimeCreate( diff = interval_time, value = real( hptr % interval_value, DP ), unit = hptr % interval_unit )                ! (in)

    if ( mod( time, interval_time ) == 0 ) then
      result = .true.
    end if

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    nullify( hptr )
  end function HstNmlInfoOutputStep

  subroutine HstNmlInfoOutputStepDisable( gthstnml, name, err )
    !
    ! このサブルーチンを使用すると, *name* に関して, 
    ! 以降は HstNmlInfoOutputStep が常に .false. を返すようになります. 
    !
    ! データ出力間隔を出力の初期設定から変更し, 
    ! データを出力するたびに時刻を明示的に指定する場合に利用することを
    ! 想定しています. 
    !
    ! HstNmlInfoEndDefine で定義モードから出力モードに
    ! 移行した後に呼び出してください. 
    ! HstNmlInfoEndDefine を呼ぶ前にこのサブルーチンを使用すると, 
    ! プログラムはエラーを発生させます. 
    !
    ! *name* に関する情報が見当たらない場合, 
    ! プログラムはエラーを発生させます. 
    ! *name* が空文字の場合にも, 
    ! プログラムはエラーを発生させます. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合にも, プログラムはエラーを発生させます. 
    !
    ! After this subroutine is used, 
    ! "HstNmlInfoOutputStep" returns .false. already 
    ! corresponding to the *name*. 
    !
    ! This subroutine expected to use when 
    ! interval of data output is changed from initialization of output, 
    ! and time is specified explicitly whenever data is output. 
    !
    ! Use after state is changed from define mode to
    ! output mode by "HstNmlInfoEndDefine". 
    ! If this subroutine is used before 
    ! "HstNmlInfoEndDefine" is used, error is occurred. 
    !
    ! When data correspond to *name* is not found, error is occurred.
    ! When *name* is blank, error is occurred too.
    !
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, DC_ENOENTRY, HST_EBADNAME, HST_EINDEFINE
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
    character(*), intent(in):: name
                              ! 変数名. 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! Variable identifier. 
                              ! Blanks at the head of the name are ignored. 
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoOutputStepDisable'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    if ( trim( name ) == '' ) then
      stat = HST_EBADNAME
      cause_c = ''
      goto 999
    end if

    if ( gthstnml % define_mode ) then
      stat = HST_EINDEFINE
      cause_c = 'OutputStepDisable'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  *gthstnml* 内から, *name* に関する history を探査.
    !  Search "history" correspond to *name* in *gthstnml*
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    call ListSearch( gthstnml_list = hptr, name = name )           ! (in)

    if ( .not. associated( hptr ) ) then
      stat = DC_ENOENTRY
      cause_c = adjustl( name )
      goto 999
    end if

    hptr % output_step_disable = .true.

    nullify( hptr )

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoOutputStepDisable

  logical function HstNmlInfoOutputValid( gthstnml, name ) result(result)
    !
    ! 変数 *name* の出力が有効であれば, 
    ! .true. を, そうでなければ .false. を返します. 
    ! *gthstnml* が初期設定されていない場合にも .false. が返ります. 
    ! *name* に関するデータが存在しない場合にも .false. が返ります. 
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, プログラムはエラーを発生させます. 
    !
    ! If output of a variable *name* is valid, 
    ! .true. is returned, otherwise .false. is returned
    ! When *gthstnml* is not initialized, .false. is returned too.
    ! When data correspond to *name* is not found, .false. is returned too.
    ! 
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_present, only: present_and_not_empty, present_and_true
    use dc_date_types, only: DC_DIFFTIME
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
    character(*), intent(in):: name
                              ! 変数名. 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! Variable identifier. 
                              ! Blanks at the head of the name are ignored. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
!!$    character(*), parameter:: subname = 'HstNmlInfoOutputValid'
  continue

    result = .false.

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) goto 999

    !-----------------------------------------------------------------
    !  情報格納変数への結合
    !  Associate a variable storing information
    !-----------------------------------------------------------------
    hptr => gthstnml % gthstnml_list
    call ListSearch( gthstnml_list = hptr, name = name )           ! (in)

    if ( .not. associated( hptr ) ) goto 999

    !-----------------------------------------------------------------
    !  出力の有効性のチェック
    !  Check validity of output
    !-----------------------------------------------------------------
    if ( hptr % interval_value > 0.0 ) then
      result = .true.
      goto 999
    end if

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    nullify( hptr )
  end function HstNmlInfoOutputValid

  subroutine HstNmlInfoPutLine( gthstnml, unit, indent, err )
    !
    ! 引数 *gthstnml* に設定されている情報を印字します. 
    ! デフォルトではメッセージは標準出力に出力されます. 
    ! *unit* に装置番号を指定することで, 出力先を変更することが可能です. 
    !
    ! Print information of *gthstnml*. 
    ! By default messages are output to standard output. 
    ! Unit number for output can be changed by *unit* argument. 
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT
    use gt4_history, only: HistoryPutLine
    implicit none
    type(GTHST_NMLINFO), intent(in):: gthstnml
    integer, intent(in), optional:: unit
                              ! 出力先の装置番号. 
                              ! デフォルトの出力先は標準出力. 
                              !
                              ! Unit number for output. 
                              ! Default value is standard output. 
    character(*), intent(in), optional:: indent
                              ! 表示されるメッセージの字下げ. 
                              !
                              ! Indent of displayed messages. 
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    type(GTHST_NMLINFO_ENTRY), pointer:: hptr =>null()
    integer:: stat
    character(STRING):: cause_c
    integer:: out_unit
    integer:: indent_len
    character(STRING):: indent_str
    character(*), parameter:: subname = 'HstNmlInfoPutLine'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( present(unit) ) then
      out_unit = unit
    else
      out_unit = STDOUT
    end if

    indent_len = 0
    indent_str = ''
    if ( present(indent) ) then
      if ( len(indent) /= 0 ) then
        indent_len = len(indent)
        indent_str(1:indent_len) = indent
      end if
    end if

    !-----------------------------------------------------------------
    !  "GTHST_NMLINFO" の設定の印字
    !  Print the settings for "GTHST_NMLINFO"
    !-----------------------------------------------------------------
    if ( gthstnml % initialized ) then
      call Printf( out_unit, indent_str(1:indent_len) // '#<GTHST_NMLINFO:: @initialized=%y define_mode=%y', l = (/gthstnml % initialized, gthstnml % define_mode/) )

      hptr => gthstnml % gthstnml_list

      do while ( associated( hptr ) )

        call Printf( out_unit, indent_str(1:indent_len) // ' #<GTHST_NMLINFO_ENTRY:: @name=%c @file=%c', c1 = trim(hptr % name), c2 = trim(hptr % file) )

        call Printf( out_unit, indent_str(1:indent_len) // '  @interval_value=%r @interval_unit=%c', r = (/hptr % interval_value/), c1 = trim(hptr % interval_unit) )

        call Printf( out_unit, indent_str(1:indent_len) // '  @output_step_disable=%y', l = (/hptr % output_step_disable/) )

        call Printf( out_unit, indent_str(1:indent_len) // '  @precision=%c @average=%y', c1 = trim(hptr % precision), l = (/ hptr % average /) )

        call Printf( out_unit, indent_str(1:indent_len) // '  @fileprefix=%c', c1 = trim(hptr % fileprefix) )

        if ( .not. gthstnml % define_mode ) then
          call Printf( out_unit, indent_str(1:indent_len) // '  @history=' )

          call HistoryPutLine( hptr % history, unit = out_unit, indent = indent_str(1:indent_len) // '   ' )
        end if

        call ListNext( gthstnml_list = hptr ) ! (inout)
      end do

      call Printf( out_unit, indent_str(1:indent_len) // ' >' )

      call Printf( out_unit, indent_str(1:indent_len) // '>' )
    else
      call Printf( out_unit, indent_str(1:indent_len) // '#<GTHST_NMLINFO:: @initialized=%y>', l = (/gthstnml % initialized/) )
    end if

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoPutLine

  subroutine HstNmlInfoResetDefault( gthstnml, err )
    !
    ! デフォルト値を残し, 登録したデータを削除します.
    !
    ! なお, 与えられた *gthstnml* が HstNmlInfoCreate によって初期設定
    ! されていない場合, プログラムはエラーを発生させます. 
    !
    ! Stored data is deleted without default settings. 
    !
    ! If *gthstnml* is not initialized by "HstNmlInfoCreate" yet, 
    ! error is occurred.
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_string, only: PutLine, Printf, Split, StrInclude, StoA, JoinChar
    use dc_types, only: DP, STRING, TOKEN, STDOUT
    use dc_error, only: StoreError, DC_NOERR, DC_ENOTINIT, HST_ENOTINDEFINE
    implicit none
    type(GTHST_NMLINFO), intent(inout):: gthstnml
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    character(STRING):: varnames
    character(TOKEN), pointer:: varnames_array(:) =>null()
    integer:: i, vnmax
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoResetDefault'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  初期設定のチェック
    !  Check initialization
    !-----------------------------------------------------------------
    if ( .not. gthstnml % initialized ) then
      stat = DC_ENOTINIT
      cause_c = 'GTHST_NMLINFO'
      goto 999
    end if

    if ( .not. gthstnml % define_mode ) then
      stat = HST_ENOTINDEFINE
      cause_c = 'ResetDefault'
      goto 999
    end if

    !-----------------------------------------------------------------
    !  変数名リストの取得
    !  Get varnames list
    !-----------------------------------------------------------------
    varnames = HstNmlInfoNames( gthstnml )
    call Split( str = varnames, sep = ',', carray = varnames_array )            ! (out)
    vnmax = size( varnames_array )

    do i = 1, vnmax
      call HstNmlInfoDelete( gthstnml = gthstnml, name = varnames_array(i) ) ! (in)
    end do

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoResetDefault

  subroutine HstNmlInfoListLast( gthstnml_list, previous, err )
    !
    ! リスト構造である *gthstnml_list* (GTHST_NMLINFO_ENTRY 型) を受け取り, 
    ! 最後のエントリに再結合して返します. 
    ! *gthstnml_list* が始めから空の場合には空状態を返します. 
    !
    ! *previous* が与えられる場合, 当該エントリの一つ前の
    ! エントリに結合します. 
    !
    ! *gthstnml_list* (type "GTHST_NMLINFO_ENTRY") that is a list structure 
    ! is recieved, and *gthstnml_list* is reassociated to 
    ! last entry, and returned. 
    ! If *gthstnml_list* is null from the beginning, null is returned.
    !
    ! If *previous* is given, an entry previous to the above entry
    ! is associated. 
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_error, only: StoreError, DC_NOERR
    implicit none
    type(GTHST_NMLINFO_ENTRY), pointer:: gthstnml_list
                              ! (inout)
    type(GTHST_NMLINFO_ENTRY), pointer, optional:: previous
                              ! (out)
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoListLast'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    if ( present( previous ) ) nullify( previous )

    !-----------------------------------------------------------------
    !  空状態の場合は何もしないで返す
    !  If null, return without change
    !-----------------------------------------------------------------
    if ( .not. associated( gthstnml_list ) ) goto 999

    !-----------------------------------------------------------------
    !  最後のエントリの *next* に結合して返す
    !  "*next*" in last entry is associated, and returned
    !-----------------------------------------------------------------
    do while ( associated( gthstnml_list % next ) )
      if ( present( previous ) ) previous => gthstnml_list
      call ListNext( gthstnml_list = gthstnml_list ) ! (inout)
    end do

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoListLast

  subroutine HstNmlInfoListNext( gthstnml_list, err )
    !
    ! リスト構造である *gthstnml_list* (GTHST_NMLINFO_ENTRY 型) を受け取り, 
    ! 次のエントリを *gthstnml_list* に再結合して返します. 
    ! 次のエントリが無い場合, *gthstnml_list* の最後のエントリの 
    ! *next* (空状態) に接続して返します. 
    ! *gthstnml_list* が始めから空の場合には空状態を返します. 
    !
    ! *gthstnml_list* (type "GTHST_NMLINFO_ENTRY") that is a list structure 
    ! is recieved, and *gthstnml_list* is reassociated to next entry, and
    ! is returned. 
    ! If next entry is not found, *gthstnml_list* is associated to 
    ! *next* in last entry (null), and returned. 
    ! If *gthstnml_list* is null from the beginning, null is returned.
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_error, only: StoreError, DC_NOERR
    implicit none
    type(GTHST_NMLINFO_ENTRY), pointer:: gthstnml_list
                              ! (inout)
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoListNext'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  空状態の場合は何もしないで返す
    !  If null, return without change
    !-----------------------------------------------------------------
    if ( .not. associated( gthstnml_list ) ) goto 999

    !-----------------------------------------------------------------
    !  次のエントリに結合して返す
    !  Next entry is associated, and returned
    !-----------------------------------------------------------------
    gthstnml_list => gthstnml_list % next

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoListNext

  subroutine HstNmlInfoListSearch( gthstnml_list, name, previous, next, err )
    !
    ! リスト構造である *gthstnml_list* (GTHST_NMLINFO_ENTRY 型) を受け取り, 
    ! 引数 *name* と同じ値を持つエントリに再結合して返します. 
    ! 見つからない場合は空状態を返します.
    ! *gthstnml_list* が始めから空の場合には空状態を返します. 
    ! 
    ! *previous* が与えられる場合, 当該エントリの一つ前の
    ! エントリに結合します. 前のエントリが無い場合には
    ! 空状態を返します. 
    !
    ! *next* が与えられる場合, 当該エントリの一つ後ろの
    ! エントリに結合します. 後ろのエントリが無い場合には
    ! 空状態を返します. 
    ! 
    ! *gthstnml_list* (type "GTHST_NMLINFO_ENTRY") that is a list structure 
    ! is recieved, and *gthstnml_list* is reassociated to 
    ! the entry that has a value that is same as argument *name*, 
    ! and returned. 
    ! If the entry is not found, null is returned. 
    ! If *gthstnml_list* is null from the beginning, null is returned. 
    !
    ! If *previous* is given, an entry previous to the above entry
    ! is associated. If previous entries are not found, 
    ! null is returned.
    !
    ! If *next* is given, an entry next to the above entry
    ! is associated. If next entries are not found, 
    ! null is returned.
    !
    use dc_trace, only: BeginSub, EndSub
    use dc_error, only: StoreError, DC_NOERR
    implicit none
    type(GTHST_NMLINFO_ENTRY), pointer:: gthstnml_list
                              ! (inout)
    character(*), intent(in):: name
                              ! 変数名. 
                              ! 先頭の空白は無視されます. 
                              ! 
                              ! Variable identifier. 
                              ! Blanks at the head of the name are ignored. 
    type(GTHST_NMLINFO_ENTRY), pointer, optional:: previous
                              ! (out)
    type(GTHST_NMLINFO_ENTRY), pointer, optional:: next
                              ! (out)
    logical, intent(out), optional:: err
                              ! 例外処理用フラグ. 
                              ! デフォルトでは, この手続き内でエラーが
                              ! 生じた場合, プログラムは強制終了します. 
                              ! 引数 *err* が与えられる場合, 
                              ! プログラムは強制終了せず, 代わりに
                              ! *err* に .true. が代入されます. 
                              !
                              ! Exception handling flag. 
                              ! By default, when error occur in 
                              ! this procedure, the program aborts. 
                              ! If this *err* argument is given, 
                              ! .true. is substituted to *err* and 
                              ! the program does not abort. 

    !-----------------------------------
    !  作業変数
    !  Work variables
    integer:: stat
    character(STRING):: cause_c
    character(*), parameter:: subname = 'HstNmlInfoListSearch'
  continue
    call BeginSub( subname )
    stat = DC_NOERR
    cause_c = ''

    !-----------------------------------------------------------------
    !  空状態の場合は何もしないで返す
    !  If null, return without change
    !-----------------------------------------------------------------
    if ( .not. associated( gthstnml_list ) ) goto 999

    !-----------------------------------------------------------------
    !  引数 *name* と同じ *name* を持つエントリを探査
    !  The entry that has *name* that is same as argument *name* is searched
    !-----------------------------------------------------------------
    if ( present( previous ) ) nullify( previous )
    if ( present( next ) ) nullify( next )
    if ( trim( adjustl( gthstnml_list % name ) ) == trim( adjustl( name ) ) ) then
      if ( present( next ) ) then
        next => gthstnml_list % next
      end if
      goto 999
    end if

    do while ( associated( gthstnml_list ) )
      if ( present( previous ) ) previous => gthstnml_list
      call ListNext( gthstnml_list = gthstnml_list ) ! (inout)
      if ( .not. associated( gthstnml_list ) ) goto 999
      if ( trim( adjustl( gthstnml_list % name ) ) == trim( adjustl( name ) ) ) then
        if ( present( next ) ) then
          next => gthstnml_list % next
        end if
        goto 999
      end if
    end do

    !-----------------------------------------------------------------
    !  終了処理, 例外処理
    !  Termination and Exception handling
    !-----------------------------------------------------------------
999 continue
    call StoreError( stat, subname, err, cause_c )
    call EndSub( subname )
  end subroutine HstNmlInfoListSearch