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T.416 y:$O x|@  Fascicle VII.6 Rec. T.416    HNote 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 fallback feature. However, this Recommendation does not define preferred fallback features. It should also be noted that use of a fallback feature may cause incorrect or misleading information to be conveyed to the user. It is particularly recommended that a fallback is not used when the feature "crossedout" is specified (see 6.1.6). 6.1HEmphasis  HPortions of text may be visually differentiated or emphasized in character imaging. Six methods of emphasis are provided: H weight; H posture; H underlining; H blinking; H image inversion; H crossingout.  HAll of these may be controlled by means of rendition selection using the presentation attribute "graphic rendition" and the control function SGR (Select Graphic Rendition).  HThe 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.  HNote 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. 6.1.1HWeight  HThis provides emphasis or deemphasis by means of varying the contrast or intensity of the character image. HUsing renditions selection, three weights are provided: H faint (decreased intensity); H normal intensity (neither faint nor bold); H bold (increased intensity).  HOnly one of these may be in effect at any one point in the character stream, so that invoking one resets the others. 6.1.2HPosture HThis causes a change of posture between an upright font and an italic font. HUsing rendition selection, two renditions are provided: H not italicized; H italicized.  HOnly one of these renditions may be in effect at any one point in the character stream, so that invoking one resets the other. 6.1.3HUnderlining HThis provides for underlining character images. Three renditions are provided: H not underlined; H underlined; H doubly underlined. '  HOnly one of these renditions may in effect at any one point in the character stream, so that invoking one resets the others.  HNote For writing systems other than those that use a horizontal writing direction, underlining may be replaced by a suitable emphasis. 6.1.4HBlinking  HThis provides for flashing of the graphic symbol in the line box ON and OFF. Three renditions are provided: H steady (not blinking); H slowly blinking; H rapidly blinking.  HOnly one of these renditions may by in effect at any one point in the character stream, so that invoking one resets the other.  HNote 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. 6.1.5HImage inversion  HThis causes the colours of the graphic symbol and the line box to be exchanged. Two renditions are provided: H positive image; H negative image.  HOnly one of these renditions may by in effect at any one point in the character stream, so that invoking one resets the other.  HNote Simple inversion of the pels within the line box area may not be sufficient for inverting the character image. 6.1.6HCrossingout  HThis 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: H not crossedout; H crossedout.  HOnly one of these renditions may by in effect at any one point in the character stream, so that invoking one resets the other. 6.2HFont selection HThe capability for font selection is based upon:  H 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;'  H 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;'  H 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).' 6.2.1HFont specification  HWithin the document profile, there is an attribute "fonts list". This specifies, for each font used in the document: H a font identifier, represented by an integer, unique within the document;'  H 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.'  HThe 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. 8(  HNote 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 nearequivalent alternative, from the repertoire of fonts available to the recipient. 6.2.2HFont designation  HThe 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.  HEach 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.  HIf 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.  HNote The selection of a substitution font may depend upon the characteristics and capabilities of the presentation device. 6.2.3HFont invocation  HThe 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.  HFor 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.  HWhen 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.  HInvocation of a character set by way of code extension dose not imply invocation of a font for that character set. 6.3HSubscript and superscript  HThe control functions PLD (Partial Line Down) and PLU (Partial Line Up) provide for characters to be imaged as subscript and superscript respectively.  HFiner control of subscript and superscript rendition is provided by the control functions VPB (Line Position Backward) and VPR (Line Position Relative). 6.4HCharacter combinations HTwo or more characters can be imaged as if they were a single symbol.  HThe control function GCC (Graphic Character Composition) within the content identifies the string of characters to be imaged as a single symbol. 7 H Definition of character presentation attributes  HPresentation 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. HThe following categories of presentation attributes are defined:  H shared attributes which are available to all character content architecture classes;' '  H layout attributes which are available to formatted and formatted processable form character content architecture classes;'  H logical attributes which are available to processable and formatted processable form character content architecture classes.' HThese attributes are listed in Table 1/T.416.  HFor each presentation attribute, a default value is defined. This value is used in the defaulting mechanism as defined in Recommendation T.412.  HIn 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 ă   x|@ 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       HP ,x-Xph 7.1XShared presentation attributes 7.1.1X alignment XCATEGORY:ph#Shared XPERMISSIBLE VALUES:h#'startaligned' X ph#'endaligned' X ph#'centred' X ph#'justified' XDEFAULT VALUE:h##9'startaligned' XDEFINITION: XThis attribute specifies the method of character alignment (see 5.2.2). XREMARKS:  XThe 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). h#This attribute can be overridden by the presentation attribute "line layout table" when any tabulation stops are specified (see 7.1.13). -+ 7.1.2X character fonts XCATEGORY:ph#Shared XphXph XSTRUCTURE:ph#10 pairs of two parameters:>n<font size X ph##99 <font identifier XPERMISSIBLE VALUES:h#font size: any positive integer X ph#font identifier: any positive integer XDEFAULT VALUES:h#font size: {none is defined} X ph#font identifier: {none is defined} XDEFINITION:  XThis attribute designates up to 10 fonts which may be used within the basic component (see5.1.2 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).  XThe 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.  XThe parameter "font identifier" is an integer equal to the font identifier associated with the font in the document profile attribute "fonts list". XREMARKS:  XOne 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). 7.1.3X character orientation XCATEGORY:ph#Shared XPERMISSIBLE VALUES:h#0, 90, 180, 270 degrees XDEFAULT VALUE:h##90 degrees XDEFINITION: XThis attribute specifies the character orientation (see 5.1.3). XREMARKS:  XThe character orientation cannot be altered within the content of a basic component. 7.1.4X character path XCATEGORY:ph#Shared XPERMISSIBLE VALUES:h#0, 90, 180, 270 degrees XDEFAULT VALUE:h##90 degrees XDEFINITION: XThis attribute specifies the character path (see 5.1.2). XREMARKS:  XThe 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). 7.1.5X character spacing XCATEGORY:ph#Shared XPERMISSIBLE VALUES:h#Any positive integer XDEFAULT VALUE:h##9The equivalent of 120 BMUs XDEFINITION:  XThis attribute specifies the character spacing which applies at the beginning of the basic component (see 5.1.4). c. XThe value of this attribute is an integer specifying the distance in SMUs. XREMARKS:  XThe 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.  XIt 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). 7.1.6X code extension announcers XCATEGORY:ph#Shared  XPERMISSIBLE VALUES:hh#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.'h  XXX  ph##p XXDEFAULT VALUE:h##9The escape sequences announcing the use of the G0 and G2 sets, the G2 set being invoked in columns 10 to 15.'h XDEFINITION:  XThis attribute announces the code extension features used in the basic component. XREMARKS:  XThe set of code extension features announced by this attribute cannot be altered within the content of a basic component. 7.1.7X first line offset XCATEGORY:ph#Shared XPERMISSIBLE VALUES:h#Any integer XDEFAULT VALUE:h##90 XDEFINITION:  XThis 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.  XThe 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. XREMARKS:  XThe 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. XThe first line offset cannot be altered within the content of a basic component. 7.1.8X graphic character sets XCATEGORY:ph#Shared  XPERMISSIBLE VALUES:hh#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.'h  XXX  ph##p XXDEFAULT VALUE:h##9The 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 set in columns 10 to 15.'h c. XDEFINITION:  XThis attribute specifies the graphic character set(s) designated and/or invoked at the beginning of the basic component. XREMARKS:  XOther 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. 7.1.9X graphic character subrepertoire XCATEGORY:ph#Shared  XPERMISSIBLE VALUES:hh#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.'h XDEFAULT VALUE:h##90 XDEFINITION:  XThis attribute identifies the subrepertoire of the graphic character repertoire of ISO 6937 used at the beginning of the basic component. XREMARKS:  XThis attribute is only applicable if the graphic character sets of ISO 6937 are used.  XOther 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 XCATEGORY:ph#Shared  XPERMISSIBLE VALUE:hh#A sequence of one or more integers corresponding to parameter values of the control function SGR (Select Graphic Rendition).'h XDEFAULT VALUE:h##90 XDEFINITION:  XThis attribute specifies the rendition parameters for font, underlining, etc., which apply at the beginning of the basic component (see 6.1). XREMARKS:  XThe graphic rendition can be altered within the content of a basic component by means of the control function SGR (Select Graphic Rendition). XNote If more than one graphic rendition parameter is encoded, then it is the user'sresponsibility to ensure that they are consistent. 7.1.11 itemization XCATEGORY:ph#Shared Xph XphhpxXSTRUCTURE:ph#Three parameters: X ph# identifier alignment; X ph# identifier start offset; X ph# identifier end offset. XPERMISSIBLE VALUES:h#Identifier alignment: >0ԌX ph# 'no itemization'; X ph# 'startaligned'; X ph# 'endaligned'. | X ph#Identifier start offset: any integer value X ph#Identifier end offset: any integer value XDEFAULT VALUES:h#Identifier alignment: "no itemization"  X phh#Identifier start offset: the distance from the line home position to the start edge of the positioning area'h X ph#Identifier end offset: 0 XDEFINITION:  XThis attribute specifies the placement of an item identifier which shall begin the basic component (see 5.2.9).  XIf the value of the parameter "identifier alignment" is "no itemization", then no item identifier is present.  XFor 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.  XThe 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".  XValues of the parameter "identifier alignment" other then "no itemization" specify the method of character alignment for the item identifier. XREMARKS:  XThe 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. XItemization cannot be altered within the content of a basic component. 7.1.12 kerning offset XCATEGORY:ph#Shared XSTRUCTURE:ph#Two parameters: start edge offset, end edge offset XPERMISSIBLE VALUES:h#Start edge offset: any nonnegative integer X ph#End edge offset: any nonnegative integer XDEFAULT VALUES:h#Start edge offset: 0 X ph#End edge offset: 0 XDEFINITION:  XThis 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. XREMARKS: XThe kerning offset cannot be altered within the content of a basic component. 7.1.13 line layout table XCATEGORY:ph#Shared XSTRUCTURE:ph#Four parameters:3xAtab reference X ph##--p22xAtab position >0 ԌX ph##--p22xAalignment X ph##--p22xAalignment string   XPERMISSIBLE VALUES:hh#Tab reference: a string of one to four decimal digits used as the reference parameter in the control function STAB (Selective Tabulation).'h X ph#Tab position: any nonnegative integer X ph#Alignment:--'startaligned' X ph##--p2'endaligned' X ph##--p2'centred' X ph##--p2'alignedaround'  X phh#Alignment string: graphic characters from the set of graphic elements specified by the presentation attributes "graphic character sets" and "graphic character subreper toire".'h  XDEFAULT VALUES:hh#The default values are such that no tabulation stops are defined.'h XDEFINITION:  XThis 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. XREMARKS:  XWhen this presentation attribute specifies any tabulation stops, the presentation attribute "alignment" is assumed to have the value w'startalignedw' (see 7.1.1).  XThe parameter "alignment string" is only present if the value of the parameter "alignment" is w'alignedaroundw'. XThe tabulation stops cannot be altered within the content of a basic component. 7.1.14 line progression XCATEGORY:ph#Shared XPERMISSIBLE VALUES:h#90, 270 degrees XDEFAULT VALUE:h##-270 degrees XDEFINITION: XThis attribute specifies the line progression (see 5.1.2). XREMARKS: XThe line progression cannot be altered within the content of a basic component. 7.1.15 line spacing XCATEGORY:ph#Shared XPERMISSIBLE VALUES:h#Any positive integer XDEFAULT VALUE:h##-The equivalent of 200 BMUs XDEFINITION:  XThis 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). XThe value of this attribute is an integer specifying the distance in SMUs. XREMARKS:  XThe 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 XCATEGORY:ph#Shared ),  XPERMISSIBLE VALUES:h#'Yes' X ph#'No' XDEFAULT VALUE:h##-'No' XDEFINITION:  XThis attribute specifies whether pairwise kerning should be performed on the content during the formatting process (see 5.2.7).  XThe value w'yesw' indicates that the formatting process should perform, if possible, pairwise kerning to the content.  XThe value w'now' specifies that pairwise kerning should not be performed on the content. XREMARKS:  XThe specification of pairwise kerning cannot be altered within the content of a basic component. 7.2XLayout presentation attributes 7.2.1X formatting indicator XCATEGORY:ph#Layout XPERMISSIBLE VALUES:h#'Yes' X ph#'No' XDEFAULT VALUE:h##-'No' XDEFINITION:  XThis attribute specifies whether the content of a basic component has been formatted by a content layout process or not.  XThe 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). XREMARKS:  XThe specification of alignment cannot be altered within the content of a basic component.  XNote 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. 7.2.2X initial offset XCATEGORY:ph#Layout XphhpxXphpXSTRUCTURE:ph#Two parameters:2p2horizontal coordinate X ph##p2vertical coordinate XPERMISSIBLE VALUES:h#Horizontal coordinate: any nonnegative integer X ph#Vertical coordinate: any nonnegative integer  XDEFAULT VALUES:hh#The default values of this attribute depend on character path, line progression and line spacing as defined in Table 2/T.416.'h /  $TABLE 2/T.416 *  Default values of the presentation attribute "initial offset" ă   XphpXp` 0       Character  Line  Horizontal  Vertical    path  progression  coordinate  coordinate      0  270  0  S     90  0  HS      90  270  S  H     90  WS  H      180  270  W  HS     90  W  S      270  270  WS  0     90  S  0       Xp` 0 Xp` P h X pW` P Horizontal dimension of basic component X pH` P Vertical dimension of basic component X pS` P Backward extent of first line box XDEFINITION: XThis attribute specifies the position of the initial point (see 5.3).  XThe 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. XREMARKS:  XThe position of the initial point cannot be altered within the content of a basic component. 7.3XLogical presentation attributes 7.3.1X indentation XCATEGORY:p` P  h#Logical XPERMISSIBLE VALUES: h##(Any nonnegative integer XDEFAULT VALUE:` P  h##(0 XDEFINITION:  XThis 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. XREMARKS: XThe indentation cannot be altered within the content of a basic component. 7.3.2X orphan size XCATEGORY:p` P  h#Logical XPERMISSIBLE VALUES: h##(Any positive integer XDEFAULT VALUE:` P  h##(1 XDEFINITION:  XThis 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.   XThe value of this attribute specifies the minimum number of lines of content that must be placed in the first basic layout object.  XIf 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. XREMARKS: XThe orphan size cannot be altered within the content of a basic component. 7.3.3X proportional line spacing XCATEGORY:p` P  h#Logical XPERMISSIBLE VALUES: h##('Yes' X p` P  h#'No' XDEFAULT VALUE:` P  h##('No' XDEFINITION:  XThis attribute specifies how the content layout process is to determine the distance between the reference lines of two successive line boxes.  XIf 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.  XIf 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). 7.3.4X widow size XCATEGORY:p` P  h#Logical XPERMISSIBLE VALUES: h##(Any positive integer XDEFAULT VALUE:` P  h##(1 XDEFINITION:  XThis 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.  XThe value of this attribute specifies the minimum number of lines of content that must be placed in the last basic layout object.  XIf 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. 7.4XContent architecture class attributes 7.4.1XContent architecture class  XThe 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: X{28260}pfor the formatted content architecture class; X{28261}pfor the processable content architecture class; X{28262}pfor the formatted processable content architecture class. / 7.4.2XContent type  XThe content architecture class attribute "content type" cannot be used to specify any of the content architecture classes defined in this Recommendation. 7.5XInteractions between presentation attributes and layout directives  XThe 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: X alignment, X character fonts, X character orientation, X character path, X first line offset, X indentation, X itemization, X kerning offset, X line layout table, X line progression, X orphan size, X pairwise kerning, X 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 X Character content portion attributes 8.1XCommon coding attributes  XThe 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 {28360}. 8.2XOther coding attributes  XNo other coding attributes are defined for content portions conforming to this Recommendation.