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Note 2 - Document application profiles may define additional restrictions on the use of the character features
defined in this section. In addition, an implementation may replace an imaging feature by an alternative fall-back feature.
However, this Recommendation does not define preferred fall-back features. It should also be noted that use of a fall-back
feature may cause incorrect or misleading information to be conveyed to the user. It is particularly recommended that a fall-
back is not used when the feature "crossed-out" is specified (see 6.1.6).
6.1 Emphasis
Portions of text may be visually differentiated or emphasized in character imaging. Six methods of emphasis are
provided:
- weight;
- posture;
- underlining;
- blinking;
- image inversion;
- crossing-out.
All of these may be controlled by means of rendition selection using the presentation attribute "graphic rendition"
and the control function SGR (Select Graphic Rendition).
The emphasis takes effect at the active position of the line box where the control function initiates it and ends at
the active position of the line box where the control function specifies an end to the emphasis or at the end of the object.
Note - Not all forms of emphasis allowed by this Recommendation are applicable to all presentation devices. For
example, in printed text, 'blinking' may not be able to be represented, a second colour may be an available alternative to
'faint' (decreased intensity), but 'image inversion' may only be practicable by the use of appropriately designed cameo fonts.
6.1.1 Weight
This provides emphasis or de-emphasis by means of varying the contrast or intensity of the character image.
Using renditions selection, three weights are provided:
- faint (decreased intensity);
- normal intensity (neither faint nor bold);
- bold (increased intensity).
Only one of these may be in effect at any one point in the character stream, so that invoking one resets the
others.
6.1.2 Posture
This causes a change of posture between an upright font and an italic font.
Using rendition selection, two renditions are provided:
- not italicized;
- italicized.
Only one of these renditions may be in effect at any one point in the character stream, so that invoking one resets
the other.
6.1.3 Underlining
This provides for underlining character images. Three renditions are provided:
- not underlined;
- underlined;
- doubly underlined.
1 Fascicle VII.6 - Rec. T.416
Only one of these renditions may in effect at any one point in the character stream, so that invoking one resets
the others.
Note - For writing systems other than those that use a horizontal writing direction, underlining may be replaced by
a suitable emphasis.
6.1.4 Blinking
This provides for flashing of the graphic symbol in the line box ON and OFF. Three renditions are provided:
- steady (not blinking);
- slowly blinking;
- rapidly blinking.
Only one of these renditions may by in effect at any one point in the character stream, so that invoking one resets
the other.
Note - Slow blinking should be taken as less than 150 ON/OFF cycles per minute and rapid blinking should be
taken as more than 150 per minute.
6.1.5 Image inversion
This causes the colours of the graphic symbol and the line box to be exchanged. Two renditions are provided:
- positive image;
- negative image.
Only one of these renditions may by in effect at any one point in the character stream, so that invoking one resets
the other.
Note - Simple inversion of the pels within the line box area may not be sufficient for inverting the character image.
6.1.6 Crossing-out
This allows characters to be marked for deletion. The method of crossing out is not defined but the characters
should be legible. Two renditions are provided:
- not crossed-out;
- crossed-out.
Only one of these renditions may by in effect at any one point in the character stream, so that invoking one resets
the other.
6.2 Font selection
The capability for font selection is based upon:
- font specification: the required fonts and their characteristics must be specified in the document profile (see
Recommendation T.414). There is no limit to the number of fonts that can be specified;
- font designation: a subset of these fonts can be designated for use within a basic component by means of
the presentation attribute "character fonts". This subset is limited to a maximum of 10 fonts;
- font invocation: any of the fonts within the subset can be invoked by means of the presentation attribute
"graphic rendition" and/or control function SGR (Select Graphic Rendition).
6.2.1 Font specification
Within the document profile, there is an attribute "fonts list". This specifies, for each font used in the document:
- a font identifier, represented by an integer, unique within the document;
- a font description consisting of a set of font attributes specifying properties that are common to all
characters of the font, e.g. weight, posture, constant or variable spacing, as well as properties that are
unique to the individual characters.
The font description includes a structured font name as defined in ISO 9541. The other font attributes allow a
recipient to select a suitable substitute font when the font specified by the structured font name is not available.
Fascicle VII.6 - Rec. T.416 2
Note - It is necessary to consider that font designs are typically proprietary, and that, in addition, the recipient may
have a limited repertoire. Thus, there can be no assurance that a particular font selected by the originator is actually
available at the recipientw's location, unless the originator has prior knowledge of the facilities available to the recipient.
Since this would not generally be true in open interchange, it is necessary to specify the font and character characteristics in
a manner that facilitates the selection of a near-equivalent alternative, from the repertoire of fonts available to the recipient.
6.2.2 Font designation
The presentation attribute "character fonts" enables a subset of up to 10 fonts from the set of fonts specified in the
attribute "fonts list" in the document profile to be designated for use within the basic component.
Each font and its size is specified together with the method of invoking the font, i.e. as the primary or one of the
alternative fonts.
If no font is designated for the primary font or for a particular alternative font, it is left to the recipient to select a
suitable font for the primary or alternative font concerned.
Note - The selection of a substitution font may depend upon the characteristics and capabilities of the presentation
device.
6.2.3 Font invocation
The control function SGR (Select Graphic Rendition) is used to invoke the primary font or one of the 9 alternative
fonts. Such an invocation can be performed anywhere within the content of a basic component.
For the initial conditions at the beginning of the basic component, the font indicated by the presentation attribute
"graphic rendition" is invoked. In the absence of this attribute, the primary font is assumed to be invoked. If no fonts have
been specified, the font used is implementation dependent.
When a designated font is invoked, any specification of weight or posture by an SGR parameter value, or by the
presentation attribute "graphic rendition", is ignored.
Invocation of a character set by way of code extension dose not imply invocation of a font for that character set.
6.3 Subscript and superscript
The control functions PLD (Partial Line Down) and PLU (Partial Line Up) provide for characters to be imaged as
subscript and superscript respectively.
Finer control of subscript and superscript rendition is provided by the control functions VPB (Line Position
Backward) and VPR (Line Position Relative).
6.4 Character combinations
Two or more characters can be imaged as if they were a single symbol.
The control function GCC (Graphic Character Composition) within the content identifies the string of characters to
be imaged as a single symbol.
7 Definition of character presentation attributes
Presentation attributes are applicable to basic logical and layout components. They specify the initial conditions at
the start of the rendition of the content of that basic component. The content architecture associated with each basic
component can have the means for changing certain of these presentation attributes by means of control functions embedded
in the content; such capabilities are indicated in the definition of each presentation attribute.
The following categories of presentation attributes are defined:
- shared attributes which are available to all character content architecture classes;
3 Fascicle VII.6 - Rec. T.416
- layout attributes which are available to formatted and formatted processable form character content
architecture classes;
- logical attributes which are available to processable and formatted processable form character content
architecture classes.
These attributes are listed in Table 1/T.416.
For each presentation attribute, a default value is defined. This value is used in the defaulting mechanism as
defined in Recommendation T.412.
In addition, values specific to character content architectures are defined for the content architecture class
attributes. These attributes are defined in Recommendation T.412.
TABLE 1/T.416
Character presentation attributes
w
┌───────────────────────────────────┬──────────────────────────────┐
│ Shared attributes │ Layout attributes │
├───────────────────────────────────┼──────────────────────────────┤
│ Alignment │ Formatting indicator │
│ Character fonts │ Initial offset │
│ Character orientation │ │
│ Character path │ │
│ Character spacing │ │
│ Code extension announcers │ │
│ First line offset ├──────────────────────────────┤
│ Graphic character sets │ Logical attributes │
│ Graphic character subrepertoire ├──────────────────────────────┤
│ Graphic rendition │ Indentation │
│ Itemization │ Proportional line spacing │
│ Kerning offset │ Orphan size │
│ Line layout table │ Widow size │
│ Line progression │ │
│ Line spacing │ │
│ Pairwise kerning │ │
└───────────────────────────────────┴──────────────────────────────┘
7.1 Shared presentation attributes
7.1.1alignment
CATEGORY: Shared
PERMISSIBLE VALUES: 'start-aligned'
'end-aligned'
'centred'
'justified'
DEFAULT VALUE: 'start-aligned'
DEFINITION:
This attribute specifies the method of character alignment (see 5.2.2).
REMARKS:
The character alignment cannot be altered within the content of a basic component.
Application of the value 'justified' may be suppressed by an occurrence of the control
function JFY (No Justify). This attribute can be overridden by the presentation
attribute "line layout table" when any tabulation stops are specified (see 7.1.13).
Fascicle VII.6 - Rec. T.416 4
7.1.2character fonts
CATEGORY: Shared
STRUCTURE: 10 pairs of two parameters:font size
font identifier
PERMISSIBLE VALUES: font size: any positive integer
font identifier: any positive integer
DEFAULT VALUES: font size: {none is defined}
font identifier: {none is defined}
DEFINITION:
This attribute designates up to 10 fonts which may be used within the basic
component (see 5.1.2 and 6.2). These fonts are referred to as the primary font,
the first alternative font, the second alternative font etc. The fonts designated must be
chosen from the fonts listed in the document profile (see Recommendation T.414).
The parameter "font size" specifies the size of the font i.e. the height of the
character image; its value is an integer representing the size of the font in SMUs.
The parameter "font identifier" is an integer equal to the font identifier
associated with the font in the document profile attribute "fonts list".
REMARKS:
One of the designated fonts may be invoked at the start of the presentation of the
content associated with a basic component by means of the presentation attribute "graphic
rendition", otherwise the primary font is assumed to be invoked. Also, fonts may be
invoked within the content by means of the control function SGR (Select Graphic
Rendition).
7.1.3character orientation
CATEGORY: Shared
PERMISSIBLE VALUES: 0, 90, 180, 270 degrees
DEFAULT VALUE: 0 degrees
DEFINITION:
This attribute specifies the character orientation (see 5.1.3).
REMARKS:
The character orientation cannot be altered within the content of a basic component.
7.1.4character path
CATEGORY: Shared
PERMISSIBLE VALUES: 0, 90, 180, 270 degrees
DEFAULT VALUE: 0 degrees
DEFINITION:
This attribute specifies the character path (see 5.1.2).
REMARKS:
The character path cannot be altered within the content of a basic component.
However, local changes of the relationship between the imaging order of the characters
and the interchange order can be specified by the control function SRS (Start Reverse
String).
7.1.5character spacing
CATEGORY: Shared
PERMISSIBLE VALUES: Any positive integer
DEFAULT VALUE: The equivalent of 120 BMUs
DEFINITION:
This attribute specifies the character spacing which applies at the beginning of the
5 Fascicle VII.6 - Rec. T.416
basic component (see 5.1.4).
Fascicle VII.6 - Rec. T.416 6
The value of this attribute is an integer specifying the distance in SMUs.
REMARKS:
The character spacing value is only used while a constant spacing font is in use; it
has no effect while a variable spacing font is in use.
It can be altered within the content of a basic component by means of the control
functions SHS (Select Character Spacing) or SCS (Set Character Spacing).
7.1.6code extension announcers
CATEGORY: Shared
PERMISSIBLE VALUES: The value of this attribute consists of the string
of escape sequences, in accordance with ISO 2022, to
announce the use of code extension features.
DEFAULT VALUE: The escape sequences
announcing the use of the G0 and G2 sets, the G2 set
being invoked in columns 10 to 15.
DEFINITION:
This attribute announces the code extension features used in the basic component.
REMARKS:
The set of code extension features announced by this attribute cannot be altered
within the content of a basic component.
7.1.7first line offset
CATEGORY: Shared
PERMISSIBLE VALUES: Any integer
DEFAULT VALUE: 0
DEFINITION:
This attribute specifies an offset along the character path from the line home
position, measured in SMUs (see 5.2.8). The offset shall be positive (in the direction
of the character path), negative (in the direction opposite to the character path) or
zero.
The position identifier by application of this offset to the line home position is
used instead of the line home position for the purposes of formatting and imaging the
first line of the basic layout object in which the content of the basic logical component
is laid out.
REMARKS:
The value of the presentation attribute "indentation" (see 7.3.1) must be set such
that the the resulting displacement of the line home position from the start edge of the
positioning area is sufficient to enable overhanging characters to be imaged within the
positioning area.
The first line offset cannot be altered within the content of a basic component.
7.1.8graphic character sets
CATEGORY: Shared
PERMISSIBLE VALUES: The value of this attribute consists of the string
of escape sequences, in accordance with ISO 2022 and
the register of ISO 2375, to designate one or more
graphic character sets, and any locking shift
functions needed to invoke these character sets.
DEFAULT VALUE: The escape sequences and
shift functions designating and invoking the primary
character set of ISO 6937/2 as the G0 set and the
supplementary character set of ISO 6937/2 as the G2
7 Fascicle VII.6 - Rec. T.416
set in columns 10 to 15.
Fascicle VII.6 - Rec. T.416 8
DEFINITION:
This attribute specifies the graphic character set(s) designated and/or invoked at
the beginning of the basic component.
REMARKS:
Other graphic character sets can be designated and/or invoked within the content of
a basic component by means of the appropriate code extension escape sequences and shift
functions.
7.1.9graphic character subrepertoire
CATEGORY: Shared
PERMISSIBLE VALUES: The value of this attribute is either 0 or the
identifier of a subrepertoire assigned in the
register of ISO 7350. The value 0 identifiers the
full repertoire of the graphic character sets that
are designated at the beginning of the basic
component.
DEFAULT VALUE: 0
DEFINITION:
This attribute identifies the subrepertoire of the graphic character repertoire of
ISO 6937 used at the beginning of the basic component.
REMARKS:
This attribute is only applicable if the graphic character sets of ISO 6937 are
used.
Other graphic character subrepertoires can be invoked within the content of a basic
component by means of the control function IGS (Identify Graphic Subrepertoire).
7.1.10 graphic rendition
CATEGORY: Shared
PERMISSIBLE VALUE: A sequence of one or more integers corresponding to
parameter values of the control function SGR (Select
Graphic Rendition).
DEFAULT VALUE: 0
DEFINITION:
This attribute specifies the rendition parameters for font, underlining, etc., which
apply at the beginning of the basic component (see 6.1).
REMARKS:
The graphic rendition can be altered within the content of a basic component by
means of the control function SGR (Select Graphic Rendition).
Note - If more than one graphic rendition parameter is encoded, then it is the
user's responsibility to ensure that they are consistent.
7.1.11 itemization
CATEGORY: Shared
STRUCTURE: Three parameters:
- identifier alignment;
9 Fascicle VII.6 - Rec. T.416
- identifier start offset;
- identifier end offset.
PERMISSIBLE VALUES: Identifier alignment:
- 'no itemization';
- 'start-aligned';
- 'end-aligned'.
Fascicle VII.6 - Rec. T.416 10
Identifier start offset: any integer value
Identifier end offset: any integer value
DEFAULT VALUES: Identifier alignment: "no itemization"
Identifier start offset: the distance from the line
home position to the start edge of the positioning
area
Identifier end offset: 0
DEFINITION:
This attribute specifies the placement of an item identifier which shall begin the
basic component (see 5.2.9).
If the value of the parameter "identifier alignment" is "no itemization", then no
item identifier is present.
For other values of the parameter "identifier alignment", the parameters "identifier
start offset" and "identifier end offset" specify offsets, in SMUs, from the line home
position along the character path which identify, respectively, the start edge and end
edge of a portion of the line box in which the item identifier will be formatted. These
offsets may be positive (in the direction of the character path), negative (in the
direction opposite to the character path) or zero.
The item identifier consists of all graphic characters preceding the first
occurrence of the control function CR (Carriage Return) in the basic component. The
content of the basic component following that CR shall be formatted as specified by the
presentation attribute "first line offset".
Values of the parameter "identifier alignment" other then "no itemization" specify
the method of character alignment for the item identifier.
REMARKS:
The value of the presentation attribute "indentation" (see 7.3.1) must be set such
that the resulting displacement of the line home position from the start edge of the
positioning area is sufficient to enable the item identifier to be imaged within the
positioning area.
Itemization cannot be altered within the content of a basic component.
7.1.12 kerning offset
CATEGORY: Shared
STRUCTURE: Two parameters: start edge offset, end edge offset
PERMISSIBLE VALUES: Start edge offset: any non-negative integer
End edge offset: any non-negative integer
DEFAULT VALUES: Start edge offset: 0
End edge offset: 0
DEFINITION:
This attribute specifies the kerning offset as a pair of integer values in SMUs (see
5.1.6). The parameter "start edge offset" specifies in distance from the edge of the
basic layout object to the start edge of the positioning area. The parameter "end edge
offset" specifies the distance from the edge of the basic layout object to the end edge
of the positioning area.
REMARKS:
The kerning offset cannot be altered within the content of a basic component.
7.1.13 line layout table
11 Fascicle VII.6 - Rec. T.416
CATEGORY: Shared
STRUCTURE: Four parameters: tab reference
tab position
alignment
alignment string
Fascicle VII.6 - Rec. T.416 12
PERMISSIBLE VALUES: Tab reference: a string of one to four decimal
digits used as the reference parameter in the
control function STAB (Selective Tabulation).
Tab position: any non-negative integer
Alignment:'start-aligned'
'end-aligned'
'centred'
'aligned-around'
Alignment string: graphic characters from the set of
graphic elements specified by the presentation
attributes "graphic character sets" and "graphic
character subreper- toire".
DEFAULT VALUES: The default values are such that no tabulation stops
are defined.
DEFINITION:
This attribute specifies the positions and types of a sequence of tabulation stops
(see 5.2.3). The value of the parameter "tab position" specifies the distance in SMUs,
in the direction of the character path, from the start edge of the positioning area to
the tabulation stop.
REMARKS:
When this presentation attribute specifies any tabulation stops, the presentation
attribute "alignment" is assumed to have the value w'start-alignedw' (see 7.1.1).
The parameter "alignment string" is only present if the value of the parameter
"alignment" is w'aligned-aroundw'.
The tabulation stops cannot be altered within the content of a basic component.
7.1.14 line progression
CATEGORY: Shared
PERMISSIBLE VALUES: 90, 270 degrees
DEFAULT VALUE: 270 degrees
DEFINITION:
This attribute specifies the line progression (see 5.1.2).
REMARKS:
The line progression cannot be altered within the content of a basic component.
7.1.15 line spacing
CATEGORY: Shared
PERMISSIBLE VALUES: Any positive integer
DEFAULT VALUE: The equivalent of 200 BMUs
DEFINITION:
This attribute only applies when proportional line spacing is not to be done by the
content layout process. In this case, it specifies the line spacing which applies at the
beginning of the basic component (see 5.3).
The value of this attribute is an integer specifying the distance in SMUs.
REMARKS:
The line spacing can be altered within the content of a basic component by means of
the control functions SVS (Select Line Spacing) or SLS (Set Line Spacing).
7.1.16 pairwise kerning
CATEGORY: Shared
13 Fascicle VII.6 - Rec. T.416
PERMISSIBLE VALUES: 'Yes'
'No'
DEFAULT VALUE: 'No'
DEFINITION:
This attribute specifies whether pairwise kerning should be performed on the content
during the formatting process (see 5.2.7).
The value w'yesw' indicates that the formatting process should perform, if
possible, pairwise kerning to the content.
The value w'now' specifies that pairwise kerning should not be performed on the
content.
REMARKS:
The specification of pairwise kerning cannot be altered within the content of a
basic component.
7.2 Layout presentation attributes
7.2.1formatting indicator
CATEGORY: Layout
PERMISSIBLE VALUES: 'Yes'
'No'
DEFAULT VALUE: 'No'
DEFINITION:
This attribute specifies whether the content of a basic component has been formatted
by a content layout process or not.
The value w'yesw' indicates that the content of the basic layout component
concerned contains layout control functions representing the effects of any use of the
control function STAB (Selective Tabulation) or of the presentation attributes
"alignment", "first line offset", "itemization" and/or "pairwise kerning" (see
12.2.1.3.1).
REMARKS:
The specification of alignment cannot be altered within the content of a basic
component.
Note - In interchange, a recipient can take advantage of this attribute only if he
has a character font that is similar to that of the sender, i.e. a font that has the same
width for each character as the sender's font.
7.2.2initial offset
CATEGORY: Layout
STRUCTURE: Two parameters:horizontal coordinate
vertical coordinate
PERMISSIBLE VALUES: Horizontal coordinate: any non-negative integer
Vertical coordinate: any non-negative integer
DEFAULT VALUES: The default values of this attribute depend on
Fascicle VII.6 - Rec. T.416 14
character path, line progression and line spacing as
defined in Table 2/T.416.
15 Fascicle VII.6 - Rec. T.416
TABLE 2/T.416
Default values of the presentation attribute "initial offset"
┌────────────┬─────────────┬────────────┬────────────┐
│ Character │ Line │ Horizontal │ Vertical │
│ path │ progression │ coordinate │ coordinate │
├────────────┼─────────────┼────────────┼────────────┤
│ 0 │ 270 │ 0 │ S │
│ │ 90 │ 0 │ H-S │
├────────────┼─────────────┼────────────┼────────────┤
│ 90 │ 270 │ S │ H │
│ │ 90 │ W-S │ H │
├────────────┼─────────────┼────────────┼────────────┤
│ 180 │ 270 │ W │ H-S │
│ │ 90 │ W │ S │
├────────────┼─────────────┼────────────┼────────────┤
│ 270 │ 270 │ W-S │ 0 │
│ │ 90 │ S │ 0 │
└────────────┴─────────────┴────────────┴────────────┘
W Horizontal dimension of basic component
H Vertical dimension of basic component
S Backward extent of first line box
DEFINITION:
This attribute specifies the position of the initial point (see 5.3).
The values of the parameters "horizontal coordinate" and "vertical coordinate"
specify the horizontal and vertical coordinates, in SMUs, of the initial point relative
to the top left corner of the basic component. The horizontal coordinate is measured
positively from the vertical axis to the right and the vertical coordinate is measured
positively from the horizontal axis downwards.
REMARKS:
The position of the initial point cannot be altered within the content of a basic
component.
7.3 Logical presentation attributes
7.3.1indentation
CATEGORY: Logical
PERMISSIBLE VALUES: Any non-negative integer
DEFAULT VALUE: 0
DEFINITION:
This attribute specifies the distance, in the direction of character path from the
start edge of the positioning area, to the initial point of the basic layout object in
which the content of the basic logical component is laid out (see Figure 10/T.416). The
distance is specified in SMUs.
REMARKS:
The indentation cannot be altered within the content of a basic component.
7.3.2orphan size
CATEGORY: Logical
PERMISSIBLE VALUES: Any positive integer
DEFAULT VALUE: 1
Fascicle VII.6 - Rec. T.416 16
DEFINITION:
This attribute only applies when the content layout process would result in the
basic logical object being laid out in two or more basic layout objects; for example, at
a page or frame boundary.
17 Fascicle VII.6 - Rec. T.416
The value of this attribute specifies the minimum number of lines of content that
must be placed in the first basic layout object.
If the number of lines remaining in the first basic layout object is less than the
value of this attribute, all the content laid out in subsequent layout objects.
REMARKS:
The orphan size cannot be altered within the content of a basic component.
7.3.3proportional line spacing
CATEGORY: Logical
PERMISSIBLE VALUES: 'Yes'
'No'
DEFAULT VALUE: 'No'
DEFINITION:
This attribute specifies how the content layout process is to determine the distance
between the reference lines of two successive line boxes.
If the value is w'yesw', the line spacing is variable and the content layout process
takes into account the forward extent of the first line box and the backward extent of
the second line box.
If the value is w'now', the line spacing does not depend on the content of the line
boxes but is determined from values set by the presentation attribute "line spacing" or
the control functions SLS (Set Line Spacing) and SVS (Select Line Spacing).
7.3.4widow size
CATEGORY: Logical
PERMISSIBLE VALUES: Any positive integer
DEFAULT VALUE: 1
DEFINITION:
This attribute only applies when the content layout process would result in the
basic logical object being laid out in two or more basic layout objects; for example, at
a page or frame boundary.
The value of this attribute specifies the minimum number of lines of content that
must be placed in the last basic layout object.
If the number of lines in the last basic layout object is less than the value of
this attribute, sufficient lines shall be moved from the end of the previous basic layout
object to meet this requirement.
7.4 Content architecture class attributes
7.4.1Content architecture class
The value of the attribute "content architecture class" of a basic component
description that conforms to this Recommendation is an ASN.1 object identifier with one
of the following values:
{ 2 8 2 6 0 }for the formatted content architecture class;
{ 2 8 2 6 1 }for the processable content architecture class;
Fascicle VII.6 - Rec. T.416 18
{ 2 8 2 6 2 }for the formatted processable content architecture class.
19 Fascicle VII.6 - Rec. T.416
7.4.2Content type
The content architecture class attribute "content type" cannot be used to specify
any of the content architecture classes defined in this Recommendation.
7.5 Interactions between presentation attributes and layout directives
The attribute "concatenation" of the document architecture (see Recommendation
T.412) is applicable to content portions belonging to the same character content
architecture class. When concatenation is in effect, as a result of the layout directive
"concatenation", then, for the following presentation attributes:
- alignment,
- character fonts,
- character orientation,
- character path,
- first line offset,
- indentation,
- itemization,
- kerning offset,
- line layout table,
- line progression,
- orphan size,
- pairwise kerning,
- widow size,
any value that is specified for the first component of the concatenated sequence applies
to all components in the sequence. Thus, in the case of presentation attributes, the
values specified for the first component override the values for the other components in
the sequence.
8 Character content portion attributes
8.1 Common coding attributes
The value of the attribute "type of coding" of a content portion description that
conforms to this Recommendation is an ASN.1 object identifier with the value
{ 2 8 3 6 0 }.
8.2 Other coding attributes
No other coding attributes are defined for content portions conforming to this
Recommendation.
Fascicle VII.6 - Rec. T.416 20