ISO/IEC 9541-4:2009

INTERNATIONAL ISO/IEC
STANDARD 9541-4
First edition
2009-04-01
Information technology — Font
information interchange —
Part 4:
Harmonization to Open Font Format
Technologies de l'information — Échange d'information sur les polices
de caractères —
Partie 4: Harmonisation au format de police de caractères ouvert

Reference number
©
ISO/IEC 2009
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©  ISO/IEC 2009
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ii © ISO/IEC 2009 – All rights reserved

Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Harmonization to Open Font Format.2
4.1 Harmonization of the elements in OFF “head” table .2
4.2 Harmonization of the elements in OFF “name” table .5
4.3 Harmonization of the elements in OFF “hhea” table .6
4.4 Harmonization of the elements in OFF “hmtx” table.7
4.5 Harmonization of the elements in OFF “vhea” table .8
4.6 Harmonization of the elements in OFF “vmtx” table .9
4.7 Harmonization of the elements in OFF “maxp” table .10
4.8 Harmonization of the elements in OFF “kern” table.10
4.9 Harmonization of the elements in OFF “post” table.12
4.10 Harmonization of the elements in OFF “CFF” table .12
4.11 Harmonization of the elements in OFF “OS/2” table .17
4.12 Harmonization of the elements in OFF “PCLT” table .21
4.13 Harmonization of the elements in OFF “VORG” table.22
4.14 Harmonization of the elements in OFF “VDMX” table .23
5 Harmonization to the glyph names in OFF file.23
6 Layout Tag Registry and ISO/IEC 10036 .23
Annex A (informative) Harmonization of numerical properties to OFFS .24
A.1 General .24
A.2 Comparison of the definitions of metric properties in OFFS and ISO/IEC 9541.24
A.2.1 Horizontal metric properties .24
A.2.2 Vertical metric properties .25
A.3 Harmonization of the numerical elements in OFF tables .26
A.3.1 Harmonization of the elements in OFF "head" table .26
A.3.2 Harmonization of the elements in OFF “hhea” table .26
A.3.3 Harmonization of the elements in OFF “hmtx” table.27
A.3.4 Harmonization of the elements in OFF “vhea” table .28
A.3.5 Harmonization of the elements in OFF “vmtx” table .29
A.3.6 Harmonization of the elements in OFF “kern” table.30
A.3.7 Harmonization of the elements in OFF "post" table .30
A.3.8 Harmonization of the elements in OFF “CFF” table .31
A.3.9 Harmonization of the elements in OFF “OS/2” table .31
A.3.10 Harmonization of the elements in OFF “PCLT” table .33
A.3.11 Harmonization of the elements in OFF “VORG” table.35
Bibliography.36

© ISO/IEC 2009 – All rights reserved iii

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
ISO/IEC 9541-4 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 34, Document description and processing languages.
ISO/IEC 9541 consists of the following parts, under the general title Information technology — Font
information interchange:
⎯ Part 1: Architecture
⎯ Part 2: Interchange format
⎯ Part 3: Glyph shape representation
⎯ Part 4: Harmonization to Open Font Format
iv © ISO/IEC 2009 – All rights reserved

Introduction
ISO/IEC 9541 is a font information interchange standard and is designed to be independent of any concrete
font file format. The Open Font Format (ISO/IEC 14496-22) is a font file format specification that is based on
the TrueType font file format. With regard to the handling and utilization of the typographic properties stored in
OFF file, ISO/IEC 14496-22 describes the implementations on Microsoft Windows or IBM OS/2 only.
Therefore, ISO/IEC 14496-22 does not specify the method for defining a font resource in ISO/IEC 9541
architectures from a given OFF file, because it is out of the scope. ISO/IEC 9541-4 fills the gap between OFF
file and font resource in ISO/IEC 9541.

© ISO/IEC 2009 – All rights reserved v

INTERNATIONAL STANDARD ISO/IEC 9541-4:2009(E)

Information technology — Font information interchange —
Part 4:
Harmonization to Open Font Format
1 Scope
ISO/IEC 9541 specifies the architecture of font resources, as well as the formats for font interchange among
information processing systems. It also specifies the architecture and formats that can be used to construct
font references in general electronic document interchange.
This part of ISO/IEC 9541 specifies the correspondences between ISO/IEC 9541 font resource and
ISO/IEC 14496-22 Open Font Format file (OFF), to define ISO/IEC 9541 font resource from a given OFF file.
The classification (required or optional), syntax, and possible values of the properties are defined in
ISO/IEC 9541-1 and ISO/IEC 9541-2. The glyph shape representation and its interpretation are defined in
ISO/IEC 9541-3.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO/IEC 9541-1, Information technology — Font information interchange — Part 1: Architecture
ISO/IEC 9541-2, Information technology — Font information interchange — Part 2: Interchange format
ISO/IEC 9541-3, Information technology — Font information interchange — Part 3: Glyph shape
representation
ISO/IEC 10036, Information technology — Font information interchange — Procedures for registration of font-
related identifiers
ISO/IEC 10180, Information technology — Processing languages — Standard Page Description Language
(SPDL)
ISO/IEC 14496-18, Information technology — Coding of audio-visual objects — Part 18: Font compression
and streaming
ISO/IEC 14496-22, Information technology — Coding of audio-visual objects — Part 22: Open Font Format
© ISO/IEC 2009 – All rights reserved 1

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 9541-1, ISO/IEC 9541-2,
ISO/IEC 9541-3, ISO/IEC 14496-22 and the following apply.
NOTE The definitions given in 3.1 and 3.2 take precedence over the definitions of the same terms given in
ISO/IEC 9541-1, ISO/IEC 9541-2, ISO/IEC 9541-3 and ISO/IEC 14496-22.
3.1
AFII glyph name
glyph name defined by the Association for Font Information Interchange (AFII)
3.2
italic
script typeface
NOTE 1 In ISO/IEC 9541, “italic” does not refer to the oblique typeface that makes the upright typeface slanted.
NOTE 2 In ISO/IEC 14496-22, “italic” means both the script typeface and the oblique typeface synthesized from the
normal typeface.
4 Harmonization to Open Font Format
4.1 Harmonization of the elements in OFF “head” table
4.1.1 “Table version number” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.1.2 “fontRevision” element
This element is used to define ISO/IEC 9541-1 DATAVERSION.
4.1.3 “checkSumAdjustment” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is used by the checksum calculation.
4.1.4 “magicNumber” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
because it is constant and specific to OFF file.
4.1.5 “flags” element
The flags element is 16 bit value to describe the feature of the OFF file. The font file of OFF stores this
element in big endian and the bit0 means its LSB, bit15 means its MSB. The bit5-10 are used by TrueType
fonts designed for Apple Macintosh font manager, but their specification is out of OFF.
a) bit0
Bit0 shows Boolean flag if Baseline is set to y=0 line. ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3
do not have per-font Boolean flag for the position of Baseline.
2 © ISO/IEC 2009 – All rights reserved

b) bit1
Bit1 shows Boolean flag if LeftSideBearing is set to x=0 line. ISO/IEC 9541-1, ISO/IEC 9541-2 and
ISO/IEC 9541-3 do not have per-font Boolean flag for the position of LeftSideBearing.
c) bit2
Bit2 shows Boolean flag if sfnt TrueType glyph procedure depends on pointsize. ISO/IEC 9541-1 and
ISO/IEC 9541-2 have no per-font boolean flag for specific glyph shape representation.
d) bit3
Bit3 shows Boolean flag if PPEM is integer. ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no
predefined property to interchange this value which depends on glyph shape representation and the glyph
shape procedure interpreter.
e) bit4
Bit4 shows Boolean flag if Microsoft instruction to change character width is used. ISO/IEC 9541-1 and
ISO/IEC 9541-2 have no per-font Boolean flag for specific glyph shape representation.
f) bit11
Bit11 shows Boolean flag if this OFF file is Agfa MicroType font. ISO/IEC 9541-1, ISO/IEC 9541-2 and
ISO/IEC 9541-3 have no predefined property to interchange this value because this value declares the font file
compression technology defined in ISO/IEC 14496-18 and has no effects on font properties.
g) bit12
Bit12 shows Boolean flag if this OFF file is converted file. ISO/IEC 9541-1, ISO/IEC 9541-2 and
ISO/IEC 9541-3 have no predefined property to interchange this value because this value declares the source
of font file and has no effects on font properties.
h) bit13
Bit13 shows Boolean flag if this OFF file is designed for Microsoft ClearType rasterizer. ISO/IEC 9541-1,
ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value because it is used
by specific implementation.
4.1.6 “unitPerEm” element
This element is used to define ISO/IEC 9541-1 RELUNITS.
4.1.7 “created” element
This element is used to define ISO/IEC 9541-1 DATAVERSION.
4.1.8 “modified” element
This element is used to define ISO/IEC 9541-1 DATAVERSION.
4.1.9 “xMin” element
This element is used to define minx in ISO/IEC 9541-1 MAXFONTEXT.
4.1.10 “yMin” element
This element is used to define miny in ISO/IEC 9541-1 MAXFONTEXT.
© ISO/IEC 2009 – All rights reserved 3

4.1.11 “xMax” element
This element is used to define maxx in ISO/IEC 9541-1 MAXFONTEXT.
4.1.12 “yMax” element
This element is used to define maxy in ISO/IEC 9541-1 MAXFONTEXT.
4.1.13 “macStyle” element
The font file of OFF stores this element in big endian and the bit0 means its LSB, bit15 means its MSB.
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
This element is used by Apple Macintosh to declare an OFF file as an embolden typeface of another typeface.
In the matching, the combination of FamilyName and macStyle is used. ISO/IEC 9541-1, ISO/IEC 9541-2 and
ISO/IEC 9541-3 do not provide such mechanism to relate a typeface to another typeface.
a) bit0
Bit0 shows Boolean flag if the glyph in this OFF file is already emboldened. This element is used to define
ISO/IEC 9541-1 WEIGHT.
b) bit1
Bit1 shows Boolean flag if the glyph in this OFF file is Italic or oblique. This element is used to define
ISO/IEC 9541-1 POSTURE.
c) bit2
Bit2 shows Boolean flag if the glyph in this OFF file has underline. This element is used to define
ISO/IEC 9541-1 DSNGROUP.
d) bit3
Bit3 shows Boolean flag if the glyph in this OFF file is outlined. This element is used to define ISO/IEC 9541-1
DSNGROUP.
e) bit4
Bit4 shows Boolean flag if the glyph in this OFF file is shadowed. This element is used to define
ISO/IEC 9541-1 DSNGROUP.
f) bit5
Bit5 shows Boolean flag if the glyph in this OFF file is condensed. This element is used to define
ISO/IEC 9541-1 PROPWIDTH.
g) bit6
Bit6 shows Boolean flag if the glyph in this OFF file is extended. This element is used to define
ISO/IEC 9541-1 PROPWIDTH.
4.1.14 “LowestRecPPEM” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
because it depends on output surface. If the information on the resolution of output surface is available, this
value can be related with ISO/IEC 9541-1 MINSIZE.
4 © ISO/IEC 2009 – All rights reserved

4.1.15 “fontDirectionHint” element
This element is used to define ISO/IEC 9541-1 NOMWRMODE.
4.1.16 “indexLocFormat” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.1.17 “glyphDataFormat” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.2 Harmonization of the elements in OFF “name” table
4.2.1 “copyright notice” element
This element is used to define ISO/IEC 9541-1 DSNCOPYRIGHT.
4.2.2 “Font Family Name” element
This element is used to define ISO/IEC 9541-1 FONTFAMILY.
4.2.3 “Font Subfamily Name” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.4 “Unique Font Identifier” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.5 “Full Font Name” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.6 “Version String” element
This element is used to define ISO/IEC 9541-1 DATAVERSION.
4.2.7 “PostScript Name” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is specific to output surface.
4.2.8 “Trademark” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.9 “Manufacture Name” element
This element is used to define ISO/IEC 9541-1 DSNSOURCE.
© ISO/IEC 2009 – All rights reserved 5

4.2.10 “Designer” element
This element is used to define ISO/IEC 9541-1 DSNSOURCE.
4.2.11 “Description” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.12 “URL Vendor” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.13 “License Description” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.14 “Preferred Family” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.15 “Compatible fullname” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.16 “Sample text” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.2.17 “PostScript CID fontname” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.3 Harmonization of the elements in OFF “hhea” table
4.3.1 “Table version number” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.3.2 “Ascender” element
This element is used to define maxy in ISO/IEC 9541-1 MAXFONTEXT.
4.3.3 “Descender” element
This element is used to define miny in ISO/IEC 9541-1 MAXFONTEXT.
4.3.4 “LineGap” element
This element is used to define ISO/IEC 9541-1 MINLINESP.
6 © ISO/IEC 2009 – All rights reserved

4.3.5 “advanceWidthMax” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.3.6 “minLeftSideBearing” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.3.7 “minRightSideBearing” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.3.8 “xMaxExtent” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.3.9 “caretSlopeRise” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is designed for text input user interface.
4.3.10 “caretSlopeRun” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is designed for text input user interface.
4.3.11 “caretOffset” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is designed for text input user interface.
4.3.12 “metricDataFormat” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.3.13 “numberofHMetrics” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.4 Harmonization of the elements in OFF “hmtx” table
4.4.1 “advanceWidth” element
This element is used to define ISO/IEC 9541-1 EX.
4.4.2 “leftSideBearning” element
This element is used to define ISO/IEC 9541-1 MINEX.
© ISO/IEC 2009 – All rights reserved 7

4.5 Harmonization of the elements in OFF “vhea” table
4.5.1 “version” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.5.2 ascent-related elements
The data structures of vhea version 1.0 (version element is set to 0x00010000) and 1.1 (version element is set
to 0x00011000) are same but the typographic definitions of the element related to ascent are different. In
following, the original “ascent” element (used in version 1.0) and “vertTypoAscender” element (used in
version 1.1) are described.
4.5.2.1 “ascent” element
This element is used to define ISO/IEC 9541-1 MINLINESP.
4.5.2.2 “vertTypoAscender” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.5.3 descent-related element
The data structures of vhea version 1.0 (version element is set to 0x00010000) and 1.1 (version element is set
to 0x00011000) are same but the typographic definitions of the element related to descent are different. In
following, the original “descent” element (used in version 1.0) and “vertTypoDescender” element (used in
version 1.1) are described.
4.5.3.1 “descent” element
This element is used to define ISO/IEC 9541-1 MINLINESP.
4.5.3.2 “vertTypoDescender” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
4.5.4 linegap-related element
The data structures of vhea version 1.0 (version element is set to 0x00010000) and 1.1 (version element is set
to 0x00011000) are same but the typographic definitions of the element related to linegap are different. In
following, the original “lineGap” element (used in version 1.0) and “vertTypoLineGap” element (used in version
1.1) are described.
4.5.4.1 “lineGap” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value,
because it is fixed to 0.
4.5.4.2 “vertTypoLineGap” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value.
8 © ISO/IEC 2009 – All rights reserved

4.5.5 “advanceHeightMax” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.5.6 “minTopSideBearing” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.5.7 “minBottomSideBearing” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.5.8 “ymaxExtent” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this
statistical value, it should be consistent with the value calculated from per-glyph properties.
4.5.9 “caretSlopeRise” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is designed for text input user interface.
4.5.10 “caretSlopeRun” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is designed for text input user interface.
4.5.11 “caretOffset” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is designed for text input user interface.
4.5.12 “metricDataFormat” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.5.13 “numberofVMetrics” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.6 Harmonization of the elements in OFF “vmtx” table
4.6.1 “advanceHeight” element
This element is used to define ISO/IEC 9541-1 EY.
4.6.2 “topSideBearing” element
This element is used to define maxy in ISO/IEC 9541-1 EXT.
© ISO/IEC 2009 – All rights reserved 9

4.7 Harmonization of the elements in OFF “maxp” table
4.7.1 “table version number” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.7.2 “numGlyphs” element
This element is used to define ISO/IEC 9541-1 NUMGLYPHS.
4.7.3 glyph shape representation profiles
Following elements indicates the requirement for TrueType glyph procedure interpreter by included TrueType
glyph shape representation data. ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 do not define the
detailed implementation of TrueType glyph instruction interpreter; therefore ISO/IEC 9541-1, ISO/IEC 9541-2
and ISO/IEC 9541-3 do not deal with these elements.
• maxPoints
• maxContours
• maxCompositePoints
• maxCompositeContours
• maxZones
• maxTwilightPoints
• maxStorage
• maxFunctionDefs
• maxInstructionDefs
• maxStackElements
• maxComponentElements
• maxComponentDeps
4.8 Harmonization of the elements in OFF “kern” table
The elements in OFF “kern” table are used to define ISO/IEC 9541-1 PEA or CPEA list. The “kern” table
consists from a few top level elements and one or more subtables. In OFF, the horizontal or vertical kerning
vector of specified glyph pair is calculated by the composition of the values in all subtables for specified writing
mode. ISO/IEC 9541-1 and ISO/IEC 9541-2 can interchange the composed kerning vector via the properties
ISO/IEC 9541-1 PEA or CPEA, but does not interchange the contents of each subtables separately. As the
recommendations of OFF specification notes, there are the implementation specific limitations in the
composition of kerning values; the direction of kerning vector, the range of supported subtable format and the
maximum number of subtables to be composed. The interpretation of the values in kern table should consider
these limitation of the target implementation that the OFF file is designed for.
4.8.1 “version” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
10 © ISO/IEC 2009 – All rights reserved

4.8.2 “nTables” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.8.3 The subtable elements
4.8.3.1 “version” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.8.3.2 “length” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.8.3.3 “coverage” element
The font file of OFF stores this element in big endian and the bit0 means its LSB, bit15 means its MSB. This
element consists of 16 Boolean elements.
a) bit0: “horizontal” element
This element is used to declare the writing mode of the subtable. It is used to choose the appropriate
ISO/IEC 9541-1 WRMODE to assign the values of the subtable.
b) bit1: “minimum” element
This element affects the composition algorithm for this subtable. ISO/IEC 9541 has no property to interchange
this flag transparently.
c) bit2: “cross-stream” element
This element affects the composition algorithm for this subtable. ISO/IEC 9541 has no property to interchange
this flag transparently.
d) bit3: “override” element
This element affects the composition algorithm for this subtable. ISO/IEC 9541 has no property to interchange
this flag transparently.
e) bit8-15: format element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.8.3.4 Harmonization of the elements in OFF “kern” subtable in format 0
The “kern” subtable in format 0 provides the list of paired glyph index and horizontal kerning value in FUnits.
The kerning value is used to define ISO/IEC 9541-1 PEAS.
4.8.3.5 Harmonization of the elements in OFF “kern” subtable in format 2
The “kern” subtable in format 0 provides the list of paired glyph index and horizontal kerning value in FUnits.
The kerning value is used to define ISO/IEC 9541-1 CPEAI.
© ISO/IEC 2009 – All rights reserved 11

4.9 Harmonization of the elements in OFF “post” table
4.9.1 “Version” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.9.2 “italicAngle” element
The “italic” in this element means a slanted typeface mathematically transformed from normal regular typeface.
This element is used to define ISO/IEC 9541-1 POSTUREANGLE.
4.9.3 “underlinePosition” element
This element is used to define ISO/IEC 9541-1 SCOREOFFSETY.
4.9.4 “underlineThickness” element
This element is used to define ISO/IEC 9541-1 SCORETHICK.
4.9.5 “isFixedPitch” element
This element is used to define ISO/IEC 9541-1 ESCCLASS.
4.9.6 “minMemType42” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is specific to the implementation to rasterize TrueType glyph shape representation directly.
4.9.7 “maxMemType42” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is specific to the implementation to rasterize TrueType glyph shape representation directly.
4.9.8 “minMemType1” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is specific to the implementation to rasterize TrueType glyph shape representation via shape
conversion by ISO/IEC 9541 Type 1 glyph shape representation.
4.9.9 “maxMemType1” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which is specific to the implementation to rasterize TrueType glyph shape representation via shape
conversion by ISO/IEC 9541 Type 1 glyph shape representation.
4.10 Harmonization of the elements in OFF “CFF” table
The “CFF” table of OFF file consists of glyph-independent properties per font and the glyph shape
representation. The data structure of “CFF” table is described in bibliography [2]. When the “CFF” table is
designed for 7 or 8bit character set, the content of CFF table must provide the data that is sufficient to define a
SPDL indexed font. Therefore, the syntaxes of some values in CFF table are restricted to be compatible with
SPDL indexed font.
12 © ISO/IEC 2009 – All rights reserved

4.10.1 Harmonization of the elements in Top DICT
4.10.1.1 “version” element
This element is used to define ISO/IEC 9541-1 DATAVERSION. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.1.1.
4.10.1.2 “Notice” element
ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
4.10.1.3 “Copyright” element
This element is used to define ISO/IEC 9541-1 DSNCOPYRIGHT, but SPDL indexed font does reserve the
property for this element.
4.10.1.4 “FullName” element
ISO/IEC 9541 font resource does not reserve the property for this element, but SPDL indexed font requires
this property. The syntax of value is described in ISO/IEC 10180:1995, C.4.2.1.2.
4.10.1.5 “FamilyName” element
This element is used to define ISO/IEC 9541-1 FAMILYNAME. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.1.3.
4.10.1.6 “Weight” element
This element is used to define ISO/IEC 9541-1 WEIGHT. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.1.4.
4.10.1.7 “isFixedPitch” element
This element is used to define ISO/IEC 9541-1 ESCCLASS. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.1.6.
4.10.1.8 “ItalicAngle” element
This element is used to define ISO/IEC 9541-1 POSTUREANGLE. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.1.5.
4.10.1.9 “UnderlinePosition” element
This element is used to define ISO/IEC 9541-1 SCOREOFFSETY. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.1.7.
4.10.1.10 “UnderlineThickness” element
This element is used to define ISO/IEC 9541-1 SCORETHICK. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.1.8.
4.10.1.11 “PaintType” element
This element is used to define ISO/IEC 9541-3 PAINTTYPE for Type 1 glyph shape representation (described
in ISO/IEC 9541-3:1994, 2.6.1.2). The syntax of value is described in ISO/IEC 10180:1995, C.4.2.3.
© ISO/IEC 2009 – All rights reserved 13

4.10.1.12 “CharstringType” element
This element is used to define ISO/IEC 9541-3 GSHAPES for Type 1 glyph shape representation (described
in ISO/IEC 9541-3:1994, 1.7.2). In SPDL indexed font, the value should be consistent with FontType property
described in ISO/IEC 10180:1995, C.4.2.4.
4.10.1.13 “FontMatrix” element
This element is used to define ISO/IEC 9541-1 RELUNITS. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.5.
4.10.1.14 “UniqueID” element
This element is used to define ISO/IEC 9541-3 UNIQUEID (described in ISO/IEC 9541-3:1994, 2.6.1.3). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.8.
4.10.1.15 “FontBBox” element
This element is used to define ISO/IEC 9541-1 MAXFONTEXT. The syntax of value is described in
ISO/IEC 10180:1995, C.4.2.7.
4.10.1.16 “StrokeWidth” element
ISO/IEC 9541 font resource and SPDL indexed font do not reserve the property for this element.
4.10.1.17 “XUID” element
ISO/IEC 9541 font resource and SPDL indexed font do not reserve the property for this element.
4.10.1.18 “charset” element
This element is an offset used by CFF font interpreter internally to access the charset dictionary.
ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
4.10.1.19 “Encoding” element
This element is an offset used by CFF font interpreter internally to access the encoding dictionary.
ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
4.10.1.20 “CharStrings” element
This element is an offset used by CFF font interpreter internally to access the glyph procedures. ISO/IEC 9541
and SPDL indexed font do not reserve the property for this element.
4.10.1.21 “Private” element
This element is a pair of an offset and data length used by CFF font interpreter internally to access Private
DICT. ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
4.10.1.22 “SyntheticBase” element
ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
4.10.1.23 “PostScript” element
ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
14 © ISO/IEC 2009 – All rights reserved

4.10.1.24 “BaseFontName” element
ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
4.10.1.25 “BaseFontBlend” element
ISO/IEC 9541 and SPDL indexed font do not reserve the property for this element.
4.10.1.26 Harmonization of the additional elements for CIDFonts
ISO/IEC 9541 and SPDL indexed font do not reserve the properties for following elements.
• ROS
• CIDFontVersion
• CIDFontRevision
• CIDFontType
• CIDCount
• UIDBase
• FDArray
• FDSelect
• FontName
4.10.2 Harmonization of the elements in charset DICT
The relationship between charset DICT and ISO/IEC 9541 font resource and SPDL indexed font resource is
described.
4.10.3 Harmonization of the elements in Encoding DICT
The relationship between charset DICT and ISO/IEC 9541 font resource and SPDL indexed font resource is
described.
4.10.4 Harmonization of the elements in Private DICT
4.10.4.1 “BlueValues” element
This element is used to define ISO/IEC 9541-3 ISO/IEC 9541-1 MAXFONTEXT. The syntax of value is
described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.2 “OtherBlues” element
This element is used to define ISO/IEC 9541-3 otherblues (described in ISO/IEC 9541-3:1994, 2.6.2.2). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.6.
4.10.4.3 “FamilyBlues” element
This element is used to define ISO/IEC 9541-3 familyblues (described in ISO/IEC 9541-3:1994, 2.6.2.3). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.6.
© ISO/IEC 2009 – All rights reserved 15

4.10.4.4 “FamilyOtherBlues” element
This element is used to define ISO/IEC 9541-3 familyotherblues (described in ISO/IEC 9541-3:1994, 2.6.2.4).
The syntax of value is described in ISO/IEC 10180:1995, C.4.2.6.
4.10.4.5 “BlueScale” element
This element is used to define ISO/IEC 9541-3 bluescale (described in ISO/IEC 9541-3:1994, 2.6.2.5). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.6 “BlueShift” element
This element is used to define ISO/IEC 9541-3 blueshift (described in ISO/IEC 9541-3:1994, 2.6.2.6). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.7 “BlueFuzz” element
This element is used to define ISO/IEC 9541-3 bluefuzz (described in ISO/IEC 9541-3 2.6.2.7). The syntax of
value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.8 “StdHW” element
This element is used to define ISO/IEC 9541-3 std-hw (described in ISO/IEC 9541-3:1994, 2.6.2.8.1). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.9 “StdVW” element
This element is used to define ISO/IEC 9541-3 std-vw (described in ISO/IEC 9541-3:1994, 2.6.2.8.2). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.10 “StemSnapH” element
This element is used to define ISO/IEC 9541-3 stem-snap-h (described in ISO/IEC 9541-3:1994, 2.6.2.8.4).
The syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.11 “StemSnapV” element
This element is used to define ISO/IEC 9541-3 stem-snap-v (described in ISO/IEC 9541-3:1994, 2.6.2.8.4).
The syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.12 “ForceBold” element
This element is used to define ISO/IEC 9541-3 force-bold (described in ISO/IEC 9541-3:1994, 2.6.2.8.5). The
syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.13 “LanguageGroup” element
This element is used to define ISO/IEC 9541-3 language-group (described in ISO/IEC 9541-3:1994, 2.6.2.8.6).
The syntax of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.14 “ExpansionFactor” element
ISO/IEC 9541 font resource and SPDL indexed font do not reserve the property for this element.
16 © ISO/IEC 2009 – All rights reserved

4.10.4.15 “initialRandomSeed” element
ISO/IEC 9541 font resource and SPDL indexed font do not reserve the property for this element.
4.10.4.16 “Subrs” element
This element is used to define ISO/IEC 9541-3 subrs (described in ISO/IEC 9541-3:1994, 2.6.3.4). The syntax
of value is described in ISO/IEC 10180:1995, C.4.2.7.
4.10.4.17 “defaultWidthX” element
ISO/IEC 9541 font resource and SPDL indexed font do not reserve the property for this element.
4.10.4.18 “nominalWidthX” element
ISO/IEC 9541 font resource and SPDL indexed font do not reserve the property for this element.
4.11 Harmonization of the elements in OFF “OS/2” table
4.11.1 “version” element
ISO/IEC 9541-1, ISO/IEC 9541-2 and ISO/IEC 9541-3 have no predefined property to interchange this value
which describes the concrete file structure.
4.11.2 “xAvgCharWidth” element
This element is used to define ISO/IEC 9541-1 AVGESCX.
4.11.3 “usWeightClass” element
This element is used to define ISO/IEC 9541-1 WEIGHT.
4.11.4 “usWidthClass
...