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- 7 Town
- 8 Postcode
- 9 Date
- 10 Time
- 11 Date and time
- Note - Local hosts which do not support system fields regard all system fields as marked with a zero value.
- If on the other hand an external host does not support system fields, local hosts requiring this attribute are
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- defaulting the value of the field-type attribute to "0".
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- 10.2.9.3Protected
- This attribute is only meaningful for system fields. For those local hosts which are not able to process system
- fields, this attribute is not taken into account.
- This attribute indicates whether or not the system field may be modified by the user. The value "yes" indicates that
- the local host must prevent the user from modifying the contents of the field.
- 10.2.9.4Data-source
- This attribute is only meaningful when the field-type attribute is used, the value is not equal to "0" and the
- protected attribute has the value "not protected".
- This attribute can have the values "local host" and "user" to indicate whether the data returned to the external host
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- was supplied by the local host or by the user.
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- 10.2.9.5Field-text-marking
- This attribute specifies the visual appearance on the terminal of the contents of the field. The following values
- have been identified:
- a) "explicit" means that a value for one or more of the following attributes:
- - foreground colour;
- - background colour;
- - underlining;
- - flashing;
- - reverse video;
- may explicitly be defined by the external host.
- b) "keep current attributes" means that the value of the foreground colour, background colour, underlining,
- flashing and reverse video are then those naturally defined by positioning the cursor in the field.
- In both cases, this attribute is applied by the local host as far as possible but the local host may ignore it.
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- 10.2.10Field content portion
- This content portion is used when data entry type 2 is selected. The field content portion makes use of the
- attribute operational element content type (see Recommendation T.441, or Annex A of Recommendation T.541) as follows:
- 10.2.10.1Type of coding
- This attribute may be set either by the external or local host and specifies the coding used to represent the content
- and may take one of the following values:
- - T.50 (IRV);
- - T.51 "plus space"
- The field content portion makes use of the attribute operational element content (see Recommendation T.441, or
- Annex A of Recommendation T.541) as follows:
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- Fascicle VII.7 - Rec. T.564 1
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- 10.2.10.2Content information
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- This attribute may be set either by the external or by the local host and represents the contents of the field. The
- correspondence between the content information and the different field- blocks of the field is given by the defined order of
- these field-blocks in the layout attribute of the FIELD-SE, regardless of the relative position of these parts with respect to the
- screen.
- When set by the external host, this attribute represents the initial content of the field.
- When set by the local host, this attribute represents the data entered by the user.
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- 10.2.11DATA-ENTRY-SUBPROGRAM-SE
- The DATA-ENTRY-SUBPROGRAM-SE is subordinate to the DATA-ENTRY-PROGRAM-SE. Each data entry
- subprogram applies to one and only one field. There are as many subprograms as fields in the form; consequently,
- depending on the complexity of the form, one or more data entry subprograms may be defined at the same time.
- The following attributes are mapped to the reference attribute defined in Recommendation T.441 (or in Annex A to
- Recommendation T.541).
- 10.2.11.1Reference-to-a-RULES-SE
- This attribute points to a RULES-SE. This attribute cannot take the value "undefined" and must be defined either
- explicitly or via the default value list mechanism.
- Remark on the use of prompts
- Prompts are guidance messages that may be associated with each data entry subprogram and are described by
- the corresponding PROMPT-SEs. Zero, one or two prompts may be associated with each data entry subprogram. If no
- prompt is associated, both of the relevant reference attributes will not be defined and no prompt message is to be displayed.
- It is up to the external host to use only a prompt- in or a prompt-in and a prompt-out. On the other hand some local hosts
- may not support the use of a prompt-out and consequently will ignore the relevant attribute and automatically erase the
- prompt-in. 10.2.11.2Reference-to-a-PROMPT-IN-SE
- This attribute set by the external host points to a PROMPT-SE which is displayed by the local host when this data
- entry subprogram starts. This attribute may be set to undefined if no prompt-in message is to be displayed.
- 10.2.11.3Reference-to-a-PROMPT-OUT-SE
- This attribute set by the external host points to a PROMPT-SE which is displayed by the local host when this data
- entry subprogram is stopped. This attribute may be set to undefined if no prompt- out message is to be displayed.
- Using a prompt-in and a prompt-out instead of one prompt has not been finally discussed. This is for further study.
- 10.2.11.4Reference-to-a-FIELD-SE
- The value of this attribute depends on the type of the data entry subprogram concerned (information retrieval, data
- collection or data entry "on-the-fly" or duplex data entry). When defined, it indicates the area in which input characters have
- to be echoed.
- The application defined attributes of the data entry subprogram are the following:
- 10.2.11.5Echo
- This attribute set by the external host specifies the type of echo to be performed by the local host. It may take one
- of the three values:
- - normal echo: the input character is echoed;
- - fixed echo: a fixed character is displayed;
- - null: no echo is performed.
- 10.2.11.6Echoed character
- This attribute set by the external host and taken into account only if the echo attribute is set to "fixed echo". This
- attribute specifies a character from the list described in Recommenda- tion T.51 "plus space".
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- 2 Fascicle VII.7 - Rec. T.564
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- 10.2.11.7Echoed parameter
- This attribute set by the external host specifies the videotex attributes which should apply to the echo, if any. This
- attribute may specify values for one or several of the following attributes: foreground colour, background colour, underline,
- echo size (normal size, double high, double width, double size), flashing and reverse video.
- This attribute is applied by the local host as far as possible, but the local host may ignore it.
- 10.2.12RULES-SE
- This SE is subordinate to the DATA-ENTRY-SE. It describes the rules applicable to the entry in a field: list of
- allowed characters, list of authorized retrieval functions, etc.
- The application defined attributes of the RULES-SE are the following:
- 10.2.12.1Time-out
- This attribute set by the external host defines the maximum time allowed to the user to enter data. The length of
- time is measured in seconds. Value 0 indicates that there is no time limit imposed in seconds. Value 1 is reserved for data
- entry type 1 and will be interpreted by some external hosts as a request for chained frames. A value 1 should be interpreted
- by the local host as a normal time-out. some local hosts may overwrite with their own value a time-out whose value is
- greater than 1.
- Expiration of time-out provokes termination of the data entry.
- 10.2.12.2Entry-invoke-character
- This attribute set by the external host defines how the empty positions of the field are filled after displaying the
- initial contents. The following value is identified:
- - a fixed character from T.51 plus the character "space".
- The visual appearance of the entry-invoke-character is controlled by the field-text-marking attribute. These
- characters are not entered in the field content portion and not reported to the external host.
- 10.2.12.3Local editing
- This attribute set by the external host indicates that powerful editing capabilities should be performed in the
- associated field. Such a local editing capability defined by the local host, would allow to insert/delete character/word/line,
- powerful cursor movement, etc. This local editing facility is intended to be used by applications dealing with message
- handling.
- Remark on the control of the user input
- In the general situation of an international videotex interworking the following attributes (from 10.2.12.4 to
- 10.2.12.7), specified to allow local hosts to control the users input, may not be supported by some local hosts. In those
- cases no checking of the relevant attributes will be performed by the local host.
- 10.2.12.4Length of valid choices
- This attribute may take the value 1 or 2 depending on the size of the choice (one or two digits). This attribute is
- used only in data entry type 1 and not taken into account if the D1 c command is disabled.
- 10.2.12.5List-of-enabled-choices
- This attribute is set by the external host and specifies the list of enabled choices. This attribute is not taken into
- account by the local host if the D1 c command is disabled. This attribute is used only in data entry type 1.
- 10.2.12.6Allowed-characters (for data collections)
- This attribute set by the external host indicates if the list of characters represents the allowed or forbidden
- characters.
- Possible values:
- - "allowed": means allowed characters in the list;
- - "not allowed": means forbidden characters in the list;
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- Fascicle VII.7 - Rec. T.564 3
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- - "alphabetic": only alphabetic characters may be entered;
- - "alphanumeric": only alphanumeric characters may be entered;
- - "numeric": only numeric characters may be entered.
- When this attribute does not have the value "allowed" or "not allowed", the character-list attribute must not be used
- or will be ignored.
- This attribute is only used in data-entry-type 2.
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- 10.2.12.7Character-list (for data collection)
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- List of characters according to the specified set in the type of coding attribute of the FIELD-SE. This attribute is set
- by the external host. It specifies the list of characters which may or may not be entered as user inputs in the field associated
- with the DATA-ENTRY-SUBPROGRAM-SE from which the RULES-SE is referred. The list of characters is encoded according
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- to T.51 plus "space".
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- This attribute is only used in data-entry-type 2.
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- 10.2.12.8List of valid commands
- This attribute set by the external host specifies the list of commands which are enabled and then may be used as
- values for the termination reason attribute of the RESULT-SE. Other commands are disabled and cannot be used as value
- for the termination-reason attribute. However, enabling of commands does not imply that the local host is forced to support all
- the enabled commands. It is up to the local host to do its best to properly image some commands. Some local hosts may
- transform some commands into a disconnect.
- Abbreviations:
- E: Enabled
- D: Disabled
- Y: Yes
- N: No
- CP: Indicates if a result content portion may be associated with the command
- local: Functions handled locally between the user and the local host; such functions are not exchanged on
- the international link between gateways. Some functions of this type may provoke a disconnect
- between the local and the external host.
- not used: Not used for a given type of data entry.
- Note - Further development of videotex interworking may identify a requirement to use also the commands V1, V4,
- V7 on the international link. This is for further study.
- The following list defines the valid commands taken from the list of functions defined by Recommendation F.300.
- a) Type 1: Information retrieval
- Termination reason Command LocalCP
- E/D
- - Select an application on a videotex service V1 Y
- - Leave the application and return to the first
- effective choice of the national videotex V2 N N E/D
- service (see Note 1)
- - Return to the first effective choice of the V3 N N E
- foreign videotex service
- - Leave the application and return to the point V4 Y
- from which this application was selected
- - Provide billing information V5 Y
- - Leave the videotex service (mandatory) V6 Y
- (see Note 2)
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- 4 Fascicle VII.7 - Rec. T.564
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- - Request service/application Id V7 Y
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- Fascicle VII.7 - Rec. T.564 5
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- - Declare and validate an input (see Note 3) D1
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- a) free text input a) N YE/D
- b) direct selection of a frame b) N YE/D
- c) progress through a choice from one frame c) N YE/D
- to another by the use of one or two digits
- d) select a frame through the use of a keyword d) N YE/D
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- - Correcting an input D2 Y
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- - Clearing an input D3 Y
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- - Move one step forward in the application D4 N N E/D
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- - Move to the next input field D5 -- not
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- used --
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- - Retrace the previous step D6 N N E/D
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- - Move to the previous field D7 -- not
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- used --
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- - Repeat the frame D8 Y
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- - Repeat the updated frame D9 N N E/D
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- - Return to the first menu in the application D10 N N E/D
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- - Previous menu D11 N N E/D
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- - Ask for help or guidance without leaving the D12 N N E/D
- application
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- - Redisplay the initial version of the currently D13 N N E/D
- active form
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- - Redisplay the completed version of the D14 N N E/D
- currently active form
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- - Interrupt the action in progress D15 Y
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- - Set a marker at the current point in the D16 Y
- application for access at a later time within
- the same session
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- - Abstain from forwarding the contents of the D17 -- not
- used --
- input field
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- - Declare valid a "set" of inputs D18 -- not
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- used --
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- - Time out (see Note 4) N N E
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- - End of field -- not
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- used --
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- Note 1 - If this command is not supported by the local host or if this command is disabled, then the
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- 6 Fascicle VII.7 - Rec. T.564
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- corresponding local command is mapped to a D-TERMINATE.
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- Note 2 - This command is directly mapped to a D-TERMINATE.
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- Note 3 - Some local hosts may not be able to make the difference between the four D1 sub-commands
- and consequently may replace D1 b, D1 c and D1 d by D1 a, even if disabled.
- Note 4 - The time-out is disabled by setting its value to 0.
- Remark on the use of "good-by" frames
- 1) The local host does not support the use of "good-by" frames: in this case the local host maps the
- local V2 command to a D-TERMINATE req. on the international connection.
- 2) The external host does not support the use of "good-by" frames: in this case the external host
- should disable the V2 command and the local host consequently maps a local V2 command to a D-
- TERMINATE req. on the international connection.
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- 3) Both hosts are supporting the use of "good-by" frames: in this case the external host enables the
- V2 command. If the local host sends a V2 command to the external host, the external host may
- send the "good-by" frame, followed by a D-TERMINATE req.
- b) Type 2: Data collection
- Termination reason Command LocalCP
- E/D
- - Select an application on a videotex service V1 Y
- - Leave the application and return to the first
- effective choice of the national videotex V2 N N E/D
- service (see Note 1)
- - Return to the first effective choice of the V3 N N E
- foreign videotex service
- - Leave the application and return to the point V4 Y
- from which this application was selected
- - Provide billing information V5 Y
- - Leave the videotex service (mandatory) V6 Y
- (see Note 2)
- - Request service/application Id V7 Y
- - Declare and valid an input (see Note 3) D1
- a) free text input a) N YE/D
- b) direct selection of a frame b) N YE/D
- c) progress through a choice from one frame c) -- not
- used --
- to another by the use of one or two digits
- d) select a frame through the use of a keyword d) N YE/D
- - Correcting an input D2 Y
- - Clearing an input D3 Y
- - Move one step forward in the application D4 N N E/D
- - Move to the next input field D5 N N E/D
- - Retrace the previous step D6 N N E/D
- - Move to the previous field D7 N N E/D
- - Repeat the frame D8 Y
- - Repeat the updated frame D9 N N E/D
- - Return to the first menu in the application D10 N N E/D
- - Previous menu D11 N N E/D
- - Ask for help or guidance without leaving the D12 N N E/D
- application
- - Redisplay the initial version of the currently D13 N N E/D
- active form
- - Redisplay the completed version of the D14 N N E/D
- currently active form
- - Interrupt the action in progress D15 Y
- - Set a marker at the current point in the D16 Y
- application for access at a later time within
- the same session
- - Abstain from forwarding the contents of the D17 N N E/D
- input field
- - Declare valid a "set" of inputs D18 N N E/D
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- 8 Fascicle VII.7 - Rec. T.564
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- - Time out (see Note 4) N N E
- - End of field N N E/D
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- Note 1 - If this command is not supported by the local host or if this command is disabled, then the
- corresponding local command is mapped to a D-TERMINATE.
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- Note 2 - This command is directly mapped to a D-TERMINATE.
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- Note 3 - Some local hosts may not be able to make the difference between the four D1 sub-commands
- and consequently may replace D1 b, D1 c and D1 d by D1 a, even if disabled.
- Note 4 - The time-out is disabled by setting its value to 0.
- Remark - See also remark to data-entry type 1.
- c) Types 3 and 4: Data entry on the fly/duplex data entry
- Termination reason Command LocalCP
- E/D
- - Select an application on a videotex service V1 Y
- - Leave the application and return to the first
- effective choice of the national videotex V2 N N E/D
- service (see Note 1)
- - Return to the first effective choice of the V3 N N E
- foreign videotex service
- - Leave the application and return to the point V4 Y
- from which this application was selected
- - Provide billing information V5 Y
- - Leave the videotex service V6 Y
- (see Note 2) (mandatory)
- - Request service/application Id V7 Y
- - Declare and valid an input (see Note 3) D1
- a) free text input a) N YE/D
- b) direct selection of a frame b) -- not
- used --
- c) progress through a choice from one frame c) -- not
- used --
- to another by the use of one or two digits
- d) select a frame through the use of a keyword d) -- not
- used --
- - Correcting an input D2 Y
- - Clearing an input D3 Y
- - Move one step forward in the application D4 N N E/D
- move to the next input field D5 -- not
- used --
- - Retrace the previous step D6 N N E/D
- - Move to the previous field D7 -- not
- used --
- - Repeat the frame D8 Y
- - Repeat the updated frame D9 N N E/D
- - Return to the first menu in the application D10 N N E/D
- - Previous menu D11 N N E/D
- - Ask for help or guidance without leaving the D12 N N E/D
- application
- - Redisplay the initial version of the currently D13 N N E/D
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- 10 Fascicle VII.7 - Rec. T.564
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- active form
- - Redisplay the completed version of the D14 N N E/D
- currently active form
- - Interrupt the action in progress D15 Y
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- Fascicle VII.7 - Rec. T.564 11
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- - Set a marker at the current point in the D16 Y
- application for access at a later time within
- the same session
- - Abstain from forwarding the contents of the D17 N N E/D
- input field
- - Declare valid a "set" of inputs D18 -- not
- used --
- - Time out (see Note 3) N N E
- - End of field N N E/D
- Note 1 - If this command is not supported by the local host or if this command is disabled, then the
- corresponding local command is mapped to a D-TERMINATE.
- Note 2 - This command is directly mapped to a D-TERMINATE.
- Note 3 - Time-out is disabled by setting its value to 0.
- Remark - See also remark to data-entry type 1.
- 10.2.12.8.1 Specification of local characteristics
- Within the national videotex service of country A the user may enter commands which are:
- - disabled by the external host;
- - specified as local in the list of valid commands;
- - or not used in a specific type of data entry.
- As these commands may not be passed to the external host, the following list describes the behaviour a local host
- should perform when receiving such a command:
- V1: Select an application on a videotex service
- Local action
- V2: Leave the application and return to the first effective choice of the national videotex service
- Enabled: send to the EH or D-TERMINATE
- Disabled: D-TERMINATE
- V3: Return to the first effective choice of the foreign videotex service
- Enabled: send to the EH
- Disabled: local error indication
- V4: Leave the application and return to the point from which this application was selected
- Local action
- V5: Provide billing information
- Local action
- V6: Leave the videotex service
- D-TERMINATE
- V7: Request service/application id
- Local action
- D1: Declare and valid an input
- Enabled: send to the EH
- Disabled: local error indication
- D2: Correcting an input
- Local action: delete the character, if any
- D3: Clearing an input
- Local action: delete the current field content and restart the current input
- D4: Move one step forward in the application (typically Next or # on the last field)
- Enabled: send to the EH
- Disabled: local error indication
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- 12 Fascicle VII.7 - Rec. T.564
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- D5: Move to the next input field
- Enabled: send to the EH
- Disabled: move to the next field if any
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- Fascicle VII.7 - Rec. T.564 13
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- D6: Retrace the previous field
- Enabled: send to the EH
- Disabled: local error indication
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- D7: Move to the previous field
- Enabled: send to the EH
- Disabled: move to the previous field if any
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- D8: Repeat the frame
- Local action: redisplay the display structure and the content of the data entry structure (field contents and
- prompts) then restart the data entry at the interrupted point
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- D9: Repeat the updated frame
- Enabled: send to the EH
- Disabled: local error indication
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- D10: Return to the first menu in the application
- Enabled: send to the EH
- Disabled: local error indication
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- D11: Previous menu
- Enabled: send to the EH
- Disabled: local error indication
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- D12: Ask for help or guidance without leaving the application
- Enabled: send to the EH
- Disabled: local error indication
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- D13: Redisplay the initial version of the currently active form
- Enabled: local error indication. (When no user input has been transmitted to the external host, also other
- local actions may be taken)
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- D14: Redisplay the completed version of the currently active form
- Enabled: send to the EH
- Disabled: local error indication
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- D15: Interrupt the action in progress
- Local action
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- D16: Set a marker at the current point
- For further study
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- D17: Abstain from forwarding the content (abort data collection)
- Enabled: send to the EH
- Disabled: local error indication
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- D18: Declare valid a set of inputs
- Enabled: send to the EH
- Disabled: local error indication
- - : End of field
- Enabled: send to the EH
- Disabled: move to the next field if any, otherwise local error indication
- - : Time-out
- Enabled: send to the EH
- Disabled: no action
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- 10.2.12.8.2Use of the information retrieval field in data collection
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- In some videotex services, some userw's keying action (e.g. * or Next) may automatically provoke, even in a data
- entry subprogram, the termination of the filling of the current field and a cursor movement to the information retrieval field
- where a retrieval command may be entered. Such a command, once completed, will be interpreted as a termination event by
- the local host and reported back to the external host as a termination reason.
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- 14 Fascicle VII.7 - Rec. T.564
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- Moreover, in the case of a direct access or keyword command, an associated text is also to be reported to the
- external host, setting the termination-reason-text attribute of the DATA-ENTRY- PROGRAM-SE.
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- There is not a DATA-ENTRY-SUBPROGRAM-SE present in the VIA for the information retrieval field when "data-
- collection-type" has been selected. This includes that the RULES-SE of the last data collection field, the user has "touched",
- before going to the information retrieval field, is to be used also for the information retrieval field.
- 10.2.13PROMPT-SE
- The PROMPT-SE is subordinate to the DATA-ENTRY-SE. The attributes of a PROMPT-SE are those of a BLOCK-
- SE, except for the SE-type which is PROMPT. A prompt is a message to be displayed to the user for guidance by the filling
- of a field.
- The prompt referred from a DATA-ENTRY-SUBPROGRAM-SE is automatically displayed when the data entry
- subprogram becomes active. The prompt is cancelled by the local host when the associated data entry subprogram becomes
- inactive i.e. when another data entry subprogram becomes active or when the data entry program is terminated.
- The cancelled prompt text on the screen must be replaced by a new prompt text and/or by "spaces".
- The application defined attributes of a PROMPT-SE are the following (as defined for the display structure):
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- 10.2.13.1Position
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- 10.2.13.2Dimensions
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- 10.2.14Prompt content portion
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- The prompt content portion makes use of the attributes operational element identifier, operational element content
- type, operational element content (see Recommendation T.441, resp. Annex A of Recommendation T.541) as the related
- attributes for content portions (defined in Recommendation T.412) are used for blocks.
- The application defined attributes for prompt is the following:
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- 10.2.14.1Coding attributes
- This attribute is used in the same way as for blocks, it is specified within Recommenda- tion T.412.
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- 10.2.15Application control memory structure
- The application control memory structure can be used to store any operation on the VIA, for example:
- - the display structure or parts of it (e.g. create BLOCK-SE or modify FIELD-SE) or parts of it;
- - the data entry structure or parts of it;
- - the administrative structure or parts of it;
- - the special terminal facilities structure or parts of it.
- An element from the application control memory is invoked by a D-CALL operation and applied to the VIA, if
- applicable, in both hosts.
- The application control memory structure consists of:
- - the APPLICATION-CONTROL-MEMORY-SE;
- - one or more RECORD-SEs subordinate to the APPLICATION-CONTROL-MEMORY-SE.
- The RECORD-SE contains a sequence of one or more of the operations: D-CREATE, D-DELETE, D-MODIFY,
- which do not concern SEs of the application control memory structure.
- Figure 7/T.564 describes the hierarchy of the application control memory structure constituents.
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- Fascicle VII.7 - Rec. T.564 15
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- 10.2.16APPLICATION-CONTROL-MEMORY-SE
- 10.2.17RECORD-SE
- The application defined attributes of the RECORD-SE are the following:
- 10.2.17.1Record content
- This attribute consists of a list of VIA operations which do not concern the RECORD-SE or the APPLICATION-
- CONTROL-MEMORY-SE.
- Details are depending on the ongoing work on operational structures.
- 10.3 Administrative structure
- Note - This section is provisional. Final version will be established taken into account the results of CCITT Study
- Groups I and III concerning videotex administrative and charging matters.
- 10.3.1 Overview of the administrative structure
- This structure is used for exchanging supervisory information such as:
- - items subject to negotiation (e.g. limits);
- - accounting information;
- - global information related to the state of the association;
- - global information related to the document transferred.
- This structure consists of the ADMINISTRATIVE-INFORMATION-SE which has three subordinates:
- - LOCAL-HOST-INFORMATION-SE;
- - EXTERNAL-HOST-INFORMATION-SE;
- - DOCUMENT-INFORMATION-SE.
- One and only one SE of each type should exist within the administrative structure (see Figure 8/T.564).
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- 10.3.2 ADMINISTRATIVE-INFORMATION-SE
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- This SE contains information pertinent throughout the whole association.
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- This SE makes use of the following application defined attributes:
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- 10.3.2.1External host Id
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- This attribute identifies the external host to be connected to.
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- 10.3.2.2Local host Id
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- This attribute identifies the originating host.
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- 10.3.2.3Bilateral management parameter
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- This attribute is reserved for information which is exchanged between the two gateways and can be based on
- bilateral agreement.
- 10.3.3 LOCAL-HOST-INFORMATION-SE
- This element is used to transfer information from the local host to the external host.
- This element makes use of the following application defined attribute:
- 10.3.3.1Error report to external host
- This attribute is used to indicate to the external host the reason why the local host could not handle the previously
- received reply.
- 10.3.4 EXTERNAL-HOST-INFORMATION-SE
- This element is used to transfer information from the external host to the local host.
- This element makes use of the following application defined attributes:
- 10.3.4.1Error report to local host
- This attribute is used to indicate to the local host the reason why the external host could not handle the previously
- received reply.
- 10.3.4.2Asynchronous message
- This attribute is used to transfer a warning message to the local host.
- 10.3.5 DOCUMENT-INFORMATION-SE
- This element contains attributes that supply additional charging information associated with the document and to be
- used by the local host.
- This element contains the following application defined attributes:
- 10.3.5.1Application time based charging period
- This attribute defines the length of the time base in seconds.
- 10.3.5.2Application price: frame based
- This attribute indicates the frame based price of the application in the currency of the external host.
- 10.3.5.3Application price: transaction based
- This attribute indicates the transaction based price of the application in the currency of the external host.
- 10.3.5.4Application time based charging price
- This attribute defines the price per unit in the currency of the external host.
- 10.3.5.5Communication cost: time based charging period
- The service cost corresponds to the additional cost in the currency of the external host for using a videotex
- service. This cost is time dependent. This attribute indicates the value of the period for the service cost. It may depend on
- the day and the time (for further study).
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- 10.3.5.6Communication cost: time based charging price
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- The service cost corresponds to the additional cost in the currency of the external host for using a videotex
- service. This cost is time dependent. This attribute indicates the value of the price for the service cost per time unit. It may
- depend on the day and the time (for further study).
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- 10.3.6 Items for further study concerning the administrative structure
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- a) Depending on the decisions of CCITT Study Group III on the interpretation of the item- over-limit facility, the
- introduction of an accounting-information-SE might be necessary so that the local host can provide the
- external host with limits on the:
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- - item cost;
- - time-based charging;
- - session cost;
- and the currently translation. This is for further study.
- b) The exchange of total session cost at the end of the session, which might be achieved by introducing a
- charge-info and a charge-info-request attribute to the LOCAL-HOST-SE and to the EXTERNAL-HOST-SE, is
- for further study.
- c) Introducing value added taxes is for further study.
- d) Using a result parameter is for further study.
- e) In addition to a time-based charging for the communication cost, other methods could be taken into account
- (i.e. volume oriented). This is for further study.
- 10.4 Special terminal facilities structure
- This special terminal facilities structure is concerned with information which enables the external host to reconfigure
- the videotex terminal. The following categories of such information are identified:
- - screen format;
- - dynamically redefinable character sets (DRCS);
- - redefinable colours.
- Note - If the local host do not support these categories the structure is not used.
- The special terminal facilities structure consists of:
- - one SPECIAL-TERMINAL-FACILITIES-SE;
- - zero, one or more REDEFINITION-ENTRY-SEs subordinate to the SPECIAL-TERMINAL- FACILITIES-SE.
- Terminal redefinition data shall be downloaded by the local host to the videotex terminal, before any blocks or
- fields are displayed.
- Figure 9/T.564 describes the hierarchy of the special terminal facilities structure.
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- 10.4.1 SPECIAL-TERMINAL-FACILITIES-SE
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- This element contains the following application defined attributes:
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- 10.4.1.1Measurement unit
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- This attribute specifies the unit used to express the dimensions attribute of the PAGE-SE. The following value is
- identified:
- - character box.
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- 10.4.1.2Dimensions
- This attribute consists of a pair of coordinates that specify the dimensions of the DDA of the videotex terminal.
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- These dimensions are expressed in accordance with the measurement-unit attribute.
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- 10.4.2 REDEFINITION-ENTITY-SE
- This SE contains the following application defined attribute:
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- 10.4.2.1Redefinition coding
- This attribute is subdivided in two parts: it specifies the type and it specifies the syntax used to encode the
- redefinition content. The following redefinition types have been identified:
- - DRCS;
- - colour redefinition.
- The following redefinition syntax have been identified:
- - interworking data syntax;
- - data syntax I;
- - data syntax II;
- - data syntax III.
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- 10.4.2.2Redefinition content
- This attribute contains the actual redefinition data to be downloaded to the userw's terminal. This data will
- redefine a terminal facility as identified by the redefinition coding type. It consists of a sequel of bytes coded in accordance to
- the value of the redefinition coding attribute.
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- ANNEX A
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- (to Recommendation T.564)
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- This Annex is an integral part of this Recommendation.
- This Annex specifies the constituents of the layout structure and of the operational structure which are implicitly
- created at connection time.
- Profiles:
- - document profile;
- - operational profile (for further study).
- Layout structure:
- - specific layout root;
- Operational structure:
- - data-entry-SE;
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- - result-SE;
- - result-content portion;
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- - application-control-memory-SE;
- - administrative-information-SE;
- - local-host-information-SE;
- - external-host-information-SE;
- - document-information-SE;
- - special-terminal-facilities-SE.
- Some attributes of these objects are updated at connection time with values carried by parameters of the D-
- INITIATE service element (to be detailed).
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- ANNEX B
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- This Annex is a provisional part of this Recommendation.
- This Annex describes the minimum size of the data structures which must be supported by the local host.
- Size of the display and the data entry structures: 2 K bytes;
- Size of application control memory structure: FFS;
- Number of characters that may be input in the fields: 500;
- Number of data entry subprograms: 24;
- Number of fields: 24;
- Number of rules: 24;
- Number of prompts: 24
- Number of records: FFS
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