Diff: draft-ietf-fax-feature-schema-v2-00.txt - draft-ietf-fax-feature-schema-v2-01.txt

	< draft-ietf-fax-feature-schema-v2-00.txt	draft-ietf-fax-feature-schema-v2-01.txt >
	IETF Fax working group Graham Klyne	IETF Fax working group Graham Klyne

	Internet Draft 5GM/Content Technologies	Internet Draft Content Technologies
	Category: Work-in-progress Lloyd McIntyre	Category: Work-in-progress Lloyd McIntyre
	Xerox Corporation	Xerox Corporation

	10 August 1999	5 January 2000
	Expires: February 2000	Expires: July 2000


	Content feature schema for Internet fax	Content Feature Schema for Internet Fax (V2)
	<draft-ietf-fax-feature-schema-v2-00.txt>	<draft-ietf-fax-feature-schema-v2-01.txt>

	Status of this memo	Status of this memo

	This document is an Internet-Draft and is in full conformance with	This document is an Internet-Draft and is in full conformance with
	all provisions of Section 10 of RFC 2026.	all provisions of Section 10 of RFC 2026.

	Internet-Drafts are working documents of the Internet Engineering	Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF), its areas, and its working groups. Note that	Task Force (IETF), its areas, and its working groups. Note that
	other groups may also distribute working documents as Internet-	other groups may also distribute working documents as Internet-
	Drafts.	Drafts.

	Internet-Drafts are draft documents valid for a maximum of six	Internet-Drafts are draft documents valid for a maximum of six
	months and may be updated, replaced, or obsoleted by other	months and may be updated, replaced, or obsoleted by other
	documents at any time. It is inappropriate to use Internet-Drafts	documents at any time. It is inappropriate to use Internet-Drafts
	as reference material or to cite them other than as ``work in	as reference material or to cite them other than as ``work in
	progress''.	progress''.


	The list of current Internet-Drafts can be accessed at	The list of current Internet-Drafts can be accessed at
	http://www.ietf.org/ietf/1id-abstracts.txt	http://www.ietf.org/ietf/1id-abstracts.txt


	The list of Internet-Draft Shadow Directories can be accessed at	The list of Internet-Draft Shadow Directories can be accessed at
	http://www.ietf.org/shadow.html.	http://www.ietf.org/shadow.html.

	To view the entire list of current Internet-Drafts, please check	To view the entire list of current Internet-Drafts, please check
	the "1id-abstracts.txt" listing contained in the Internet-Drafts	the "1id-abstracts.txt" listing contained in the Internet-Drafts
	Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net	Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net
	(Northern Europe), ftp.nis.garr.it (Southern Europe), munnari.oz.au	(Northern Europe), ftp.nis.garr.it (Southern Europe), munnari.oz.au
	(Pacific Rim), ftp.ietf.org (US East Coast), or ftp.isi.edu (US	(Pacific Rim), ftp.ietf.org (US East Coast), or ftp.isi.edu (US
	West Coast).	West Coast).

	Copyright Notice	Copyright Notice


	skipping to change at page 2, line 5 ¶	skipping to change at page 2, line 5 ¶
	Abstract	Abstract

	This document revises the content feature schema described in RFC	This document revises the content feature schema described in RFC
	2531, with clarifications to some of the feature tag descriptions	2531, with clarifications to some of the feature tag descriptions
	and addition of one new feature tag.	and addition of one new feature tag.

	This content feature schema is a profile of the media feature	This content feature schema is a profile of the media feature
	description mechanisms [1,2,3] for use in performing capability	description mechanisms [1,2,3] for use in performing capability
	exchange between extended Internet fax systems [5].	exchange between extended Internet fax systems [5].


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	Table of contents	Table of contents

	1. Introduction ............................................3	1. Introduction ............................................3
	1.1 Organization of this document 3	1.1 Organization of this document 3
	1.2 Terminology and document conventions 3	1.2 Terminology and document conventions 3
	1.3 Discussion of this document 4	1.3 Discussion of this document 4
	2. Fax feature schema syntax ...............................4	2. Fax feature schema syntax ...............................4
	3. Internet fax feature tags ...............................5	3. Internet fax feature tags ...............................5
	3.1 Image size 5	3.1 Image size 5

	skipping to change at page 3, line 5 ¶	skipping to change at page 3, line 5 ¶
	A.9 Image data coding 46	A.9 Image data coding 46
	A.10 Image coding constraint 48	A.10 Image coding constraint 48
	A.11 JBIG stripe size 50	A.11 JBIG stripe size 50
	A.12 Image interleave 52	A.12 Image interleave 52
	A.13 Color subsampling 54	A.13 Color subsampling 54
	A.14 MRC availability and mode 56	A.14 MRC availability and mode 56
	A.15 MRC maximum stripe size 58	A.15 MRC maximum stripe size 58
	Appendix B: TIFF mode descriptions .........................60	Appendix B: TIFF mode descriptions .........................60
	Appendix C: Changes from RFC 2531 ..........................66	Appendix C: Changes from RFC 2531 ..........................66


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	Full copyright statement ...................................67	Full copyright statement ...................................67

	1. Introduction	1. Introduction

	This document revises the content feature schema described in RFC	This document revises the content feature schema described in RFC
	2531, with clarifications to some of the feature tag descriptions	2531, with clarifications to some of the feature tag descriptions
	and addition of one new feature tag.	and addition of one new feature tag.

	This content feature schema is a profile of the media feature	This content feature schema is a profile of the media feature
	description mechanisms [1,2,3] for use in performing capability	description mechanisms [1,2,3] for use in performing capability

	exchange between extended Internet fax systems [5].	exchange between Extended Internet Fax systems [5].


	The media feature desription mechanisms not describe any specific	The media feature description mechanisms not describe any specific
	mechanisms for communicating capability information, but do presume	mechanisms for communicating capability information, but do presume
	that any such mechanisms will transfer textual values. I	that any such mechanisms will transfer textual values. I

	coonjunction with this feature schema, they specify a textual	conjunction with this feature schema, they specify a textual format
	format to be used for describing Internet fax capability	to be used for describing Internet Fax capability information.
	information.

	The range of capabilities that can be indicated are based on those	The range of capabilities that can be indicated are based on those
	covered by the TIFF file format for Internet fax [7] and Group 3	covered by the TIFF file format for Internet fax [7] and Group 3
	facsimile [6]. A companion document [4] describes the relationship	facsimile [6]. A companion document [4] describes the relationship
	and mapping between this schema and Group 3 fax capabilities.	and mapping between this schema and Group 3 fax capabilities.

	1.1 Organization of this document	1.1 Organization of this document

	Section 2 specifies the overall syntax for fax feature descriptions	Section 2 specifies the overall syntax for fax feature descriptions
	by reference to the media feature registration and syntax documents	by reference to the media feature registration and syntax documents

	skipping to change at page 4, line 5 ¶	skipping to change at page 4, line 5 ¶

	The term "extended Internet fax system" is used to describe any	The term "extended Internet fax system" is used to describe any
	software, device or combination of these that conforms to the	software, device or combination of these that conforms to the
	specification "Extended Facsimile Using Internet Mail" [5].	specification "Extended Facsimile Using Internet Mail" [5].

	"capability exchange" describes any transfer of information between	"capability exchange" describes any transfer of information between
	communicating systems that is used to indicate system capabilities	communicating systems that is used to indicate system capabilities
	and hence determine the form of data transferred. This term covers	and hence determine the form of data transferred. This term covers
	both one-way and two-way transfers of capability information.	both one-way and two-way transfers of capability information.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	"capability identification" is a particular form of capability	"capability identification" is a particular form of capability
	exchange in which a receiving system provides capability	exchange in which a receiving system provides capability
	information to a sending system.	information to a sending system.

	"capability description" is a collection of data presented in some	"capability description" is a collection of data presented in some
	specific format that describes the capabilities of some	specific format that describes the capabilities of some
	communicating entity. It may exist separately from any specific	communicating entity. It may exist separately from any specific
	capability exchange mechanism.	capability exchange mechanism.


	skipping to change at page 5, line 5 ¶	skipping to change at page 5, line 5 ¶
	described in "Media Feature Tag Registration Procedure" [1].	described in "Media Feature Tag Registration Procedure" [1].

	NOTE: Media feature registration provides a base	NOTE: Media feature registration provides a base
	vocabulary of features that correspond to media handling	vocabulary of features that correspond to media handling
	capabilities. The feature set syntax provides a	capabilities. The feature set syntax provides a
	mechanism and format for combining these to describe	mechanism and format for combining these to describe
	combinations of features. This memo indicates those	combinations of features. This memo indicates those
	features that may be associated with extended Internet	features that may be associated with extended Internet
	fax systems.	fax systems.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	3. Internet fax feature tags	3. Internet fax feature tags

	This section enumerates and briefly describes a number of feature	This section enumerates and briefly describes a number of feature
	tags that are defined for use with extended Internet fax systems	tags that are defined for use with extended Internet fax systems
	and applications. These tags may be used also by other systems and	and applications. These tags may be used also by other systems and
	applications that support corresponding capabilities.	applications that support corresponding capabilities.

	The feature tags presented below are those that an extended	The feature tags presented below are those that an extended
	Internet fax system is expected to recognize its ability or non-	Internet fax system is expected to recognize its ability or non-

	skipping to change at page 6, line 5 ¶	skipping to change at page 6, line 5 ¶
	size-x <Rational> (>0)	size-x <Rational> (>0)
	size-y <Rational> (>0)	size-y <Rational> (>0)

	Reference: this document, Appendix A.	Reference: this document, Appendix A.

	These feature values indicate a rendered document size in inches.	These feature values indicate a rendered document size in inches.

	Where the actual size is measured in millimetres, a conversion	Where the actual size is measured in millimetres, a conversion
	factor of 10/254 may be applied to yield an exact inch-based value.	factor of 10/254 may be applied to yield an exact inch-based value.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	3.2 Resolution	3.2 Resolution

	Feature tag name Legal values	Feature tag name Legal values
	---------------- ------------	---------------- ------------
	dpi <Integer> (>0)	dpi <Integer> (>0)
	dpi-xyratio <Rational> (>0)	dpi-xyratio <Rational> (>0)

	Reference: "Media Features for Display, Print, and Fax" [3], and	Reference: "Media Features for Display, Print, and Fax" [3], and
	this document appendix A.	this document appendix A.

	skipping to change at page 7, line 5 ¶	skipping to change at page 7, line 5 ¶
	continuous	continuous

	Reference: "Media Features for Display, Print, and Fax" [3].	Reference: "Media Features for Display, Print, and Fax" [3].

	NOTE: Where the recipient indicates specific support for	NOTE: Where the recipient indicates specific support for
	hard copy or soft copy media type, a sender of color	hard copy or soft copy media type, a sender of color
	image data may wish to adjust the color components (e.g.	image data may wish to adjust the color components (e.g.
	per the related rules of ITU recommendation T.42 [9]) to	per the related rules of ITU recommendation T.42 [9]) to
	improve rendered image quality on that medium.	improve rendered image quality on that medium.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	3.4 Paper Size	3.4 Paper Size

	Feature tag name Legal values	Feature tag name Legal values
	---------------- ------------	---------------- ------------
	paper-size A4	paper-size A4
	A3	A3
	B4	B4
	letter	letter
	legal	legal

	skipping to change at page 8, line 5 ¶	skipping to change at page 8, line 5 ¶

	NOTE: No ability to indicate any specific or named color	NOTE: No ability to indicate any specific or named color
	is implied by this option. Some devices might use	is implied by this option. Some devices might use
	different intensity levels rather than different hues for	different intensity levels rather than different hues for
	distinction.	distinction.

	In the context of Internet fax, 'limited' is interpreted as one-	In the context of Internet fax, 'limited' is interpreted as one-
	bit-per-color-sample (RGB, CMY or CMYK), depending on the color	bit-per-color-sample (RGB, CMY or CMYK), depending on the color
	space used.	space used.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	'Mapped' indicates that pixel color values are mapped in some	'Mapped' indicates that pixel color values are mapped in some
	specifiable way to a multi-component color space. The 'color-	specifiable way to a multi-component color space. The 'color-
	levels' tag may be used to indicate the number of distinct colors	levels' tag may be used to indicate the number of distinct colors
	available; in its absence, sufficient levels to display a	available; in its absence, sufficient levels to display a
	photographic image should be assumed.	photographic image should be assumed.

	'Grey' indicates a continuous tone grey-scale capability.	'Grey' indicates a continuous tone grey-scale capability.

	'Full' indicates full continuous tone color capability.	'Full' indicates full continuous tone color capability.

	skipping to change at page 9, line 5 ¶	skipping to change at page 9, line 5 ¶
	CIELAB-b-depth	CIELAB-b-depth
	CIELAB-L-min <integer>	CIELAB-L-min <integer>
	CIELAB-L-max	CIELAB-L-max
	CIELAB-a-min	CIELAB-a-min
	CIELAB-a-max	CIELAB-a-max
	CIELAB-b-min	CIELAB-b-min
	CIELAB-b-max	CIELAB-b-max

	Reference: this document, appendix A.	Reference: this document, appendix A.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	The general model for image handling (both color and non-color) is	The general model for image handling (both color and non-color) is
	described here from a receiver's perspective; a similar model	described here from a receiver's perspective; a similar model
	operates in the reverse direction for a scan/send perspective:	operates in the reverse direction for a scan/send perspective:

	raw bit pixel color physical	raw bit pixel color physical
	stream -(A)-> values -(B)-> values -(C)-> rendition	stream -(A)-> values -(B)-> values -(C)-> rendition

	- "raw bit stream" is a stream of coded bits	- "raw bit stream" is a stream of coded bits


	skipping to change at page 10, line 5 ¶	skipping to change at page 10, line 5 ¶
	values may simply be omitted from a capability description.	values may simply be omitted from a capability description.

	Grey scale and bi-level images are handled within this framework as	Grey scale and bi-level images are handled within this framework as
	a special case, having a 1-component color model. The following	a special case, having a 1-component color model. The following
	features are used for describing color capabilities:	features are used for describing color capabilities:

	'color-levels' indicates the number of distinct values for each	'color-levels' indicates the number of distinct values for each
	picture element, and applies to all but bi-level images. For bi-	picture element, and applies to all but bi-level images. For bi-
	level images, a value of 2 is implied.	level images, a value of 2 is implied.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	'color-space' is used mainly with 'Mapped' and 'Full', but could be	'color-space' is used mainly with 'Mapped' and 'Full', but could be
	used with other modes if the exact color or color model used is	used with other modes if the exact color or color model used is
	significant. Two kinds of color space can be distinguished:	significant. Two kinds of color space can be distinguished:
	device-dependent and calibrated. Device dependent spaces are named	device-dependent and calibrated. Device dependent spaces are named
	here as 'Device-xxx', and are used to indicate a color space that	here as 'Device-xxx', and are used to indicate a color space that
	is defined by the receiving device. Calibrated color spaces	is defined by the receiving device. Calibrated color spaces
	presume the existence of a rendering system that is calibrated with	presume the existence of a rendering system that is calibrated with
	respect to an indicated definition, and is capable of processing	respect to an indicated definition, and is capable of processing
	the device-independent color information accordingly.	the device-independent color information accordingly.

	skipping to change at page 10, line 42 ¶	skipping to change at page 10, line 42 ¶
	defined in ITU T.4 [13], section E.6.7). When the illuminant is	defined in ITU T.4 [13], section E.6.7). When the illuminant is
	specified by its color temperature, the token string 'CTnnnn' is	specified by its color temperature, the token string 'CTnnnn' is
	used, where 'nnnn' is a decimal number that is the color	used, where 'nnnn' is a decimal number that is the color
	temperature in kelvins; e.g. CT7500 indicates an illuminant color	temperature in kelvins; e.g. CT7500 indicates an illuminant color
	temperature of 7500K.	temperature of 7500K.

	NOTE: ITU T.4 indicates a binary representation for color	NOTE: ITU T.4 indicates a binary representation for color
	temperature values.	temperature values.

	In practice, much of the illuminant detail given here	In practice, much of the illuminant detail given here

	will proably be unused by Internet fax. The only value	will probably be unused by Internet fax. The only value
	likely to be specified is 'D50', which is the default	likely to be specified is 'D50', which is the default
	color illuminant for Group 3 fax.	color illuminant for Group 3 fax.

	'CIELAB-L-depth', 'CIELAB-a-depth' and 'CIELAB-b-depth' indicate	'CIELAB-L-depth', 'CIELAB-a-depth' and 'CIELAB-b-depth' indicate
	the number of different values that are possible for the L, a and	the number of different values that are possible for the L, a and
	b* color components respectively, and are significant only when	b* color components respectively, and are significant only when
	colors are represented in a CIELAB color space. These features	colors are represented in a CIELAB color space. These features

	would be used with palettized color, or with full color where each	would be used with palletized color, or with full color where each
	color component has a different number of possible values.	color component has a different number of possible values.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	Color depth values relate to the representation of colour values	Color depth values relate to the representation of colour values
	rather than the resolution of a scanning or rendering device.	rather than the resolution of a scanning or rendering device.
	Thus, if 256 different L-component values can be represented then	Thus, if 256 different L-component values can be represented then
	the assertion (CIELAB-L-depth<=256) is used, even if a receiving	the assertion (CIELAB-L-depth<=256) is used, even if a receiving
	device can render only 100 distinct luminance values. (Color	device can render only 100 distinct luminance values. (Color
	rendering resolution is not covered by this memo.)	rendering resolution is not covered by this memo.)

	The 'CIELAB-x-min' and 'CIELAB-x-max' values indicate a color gamut	The 'CIELAB-x-min' and 'CIELAB-x-max' values indicate a color gamut
	(i.e. a range of color values that are used or may be rendered). A	(i.e. a range of color values that are used or may be rendered). A

	skipping to change at page 12, line 5 ¶	skipping to change at page 12, line 5 ¶
	'image-file-structure' defines how the coded image data is wrapped	'image-file-structure' defines how the coded image data is wrapped
	and formatted. The following options are defined here:	and formatted. The following options are defined here:

	o 'TIFF' indicates image data enclosed and tagged using TIFF	o 'TIFF' indicates image data enclosed and tagged using TIFF
	structures described in Adobe's definition of TIFF [20].	structures described in Adobe's definition of TIFF [20].

	o 'TIFF-limited' indicates image data structured using TIFF, but	o 'TIFF-limited' indicates image data structured using TIFF, but
	with the limitations on the placement of Image File Descriptors	with the limitations on the placement of Image File Descriptors
	(IFDs) indicated in section 4.4.6 of RFC 2301 [7].	(IFDs) indicated in section 4.4.6 of RFC 2301 [7].


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	o 'TIFF-minimal' indicates a TIFF image format that meets the IFD	o 'TIFF-minimal' indicates a TIFF image format that meets the IFD
	placement, byte ordering and bit ordering requirements of the	placement, byte ordering and bit ordering requirements of the
	"minimal black and white mode" described in section 3.5 of RFC	"minimal black and white mode" described in section 3.5 of RFC
	2301 [7], also known as TIFF-S.	2301 [7], also known as TIFF-S.

	o 'TIFF-MRC' uses a TIFF image structure [20] augmented with a sub-	o 'TIFF-MRC' uses a TIFF image structure [20] augmented with a sub-
	IFD structure, described for the "Mixed Raster Content mode" in	IFD structure, described for the "Mixed Raster Content mode" in
	section 8.1.2 of RFC 2301 [7], also known as TIFF-M. This	section 8.1.2 of RFC 2301 [7], also known as TIFF-M. This
	provides a file structure to contain composite images constructed	provides a file structure to contain composite images constructed
	using the MRC model described in T.44 [15] (see tag 'MRC-mode').	using the MRC model described in T.44 [15] (see tag 'MRC-mode').


	o 'TIFF-MRC-limited' is the same as 'TIFF-MRC', except that the IFD	o 'TIFF-MRC-limited' is the same as 'TIFF-MRC', except that the
	placement is constrained in the same was as 'TIFF-limited'.	primary IFD (i.e. top-level IFDs, as opposed to sub-IFDs)
		placement is constrained in the same way as 'TIFF-limited'.

	'image-coding' describes how raw image data is compressed and coded	'image-coding' describes how raw image data is compressed and coded
	as a sequence of bits. These are generic tags that may apply to a	as a sequence of bits. These are generic tags that may apply to a
	range of file formats and usage environments.	range of file formats and usage environments.

	'image-coding-constraint' describes how the raw image data coding	'image-coding-constraint' describes how the raw image data coding
	method is constrained to meet a particular operating environment.	method is constrained to meet a particular operating environment.
	Options defined here are JBIG and JPEG coding constraints that	Options defined here are JBIG and JPEG coding constraints that
	apply in typical Group 3 fax environments.	apply in typical Group 3 fax environments.


	skipping to change at page 13, line 5 ¶	skipping to change at page 13, line 5 ¶
	is not normally sufficient to describe the capabilities	is not normally sufficient to describe the capabilities
	of a recipient. A general rule is that sufficient detail	of a recipient. A general rule is that sufficient detail
	should be provided to exclude any unsupported features.	should be provided to exclude any unsupported features.

	For extended Internet fax, image-file-structure and	For extended Internet fax, image-file-structure and
	image-coding should always be specified, together with	image-coding should always be specified, together with
	additional values described above as needed to clearly	additional values described above as needed to clearly
	indicate which feature tag values are supported and which	indicate which feature tag values are supported and which
	are not. (See also the examples in section 4.)	are not. (See also the examples in section 4.)


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	3.8 MRC mode	3.8 MRC mode

	Feature tag name Legal values	Feature tag name Legal values
	---------------- ------------	---------------- ------------
	MRC-mode <Integer> (0..7) (per ITU T.44 [15])	MRC-mode <Integer> (0..7) (per ITU T.44 [15])
	MRC-max-stripe-size <Integer>	MRC-max-stripe-size <Integer>

	Reference: this document, appendix A.	Reference: this document, appendix A.


	skipping to change at page 14, line 5 ¶	skipping to change at page 14, line 5 ¶

	4. Examples	4. Examples

	Some of the examples contain comments introduced by '--...'. These	Some of the examples contain comments introduced by '--...'. These
	are not part of the allowed capability description syntax. They	are not part of the allowed capability description syntax. They
	are included here to explain some of the constructs used.	are included here to explain some of the constructs used.

	The level of detail captured here reflects that used for capability	The level of detail captured here reflects that used for capability
	identification in Group 3 facsimile.	identification in Group 3 facsimile.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	4.1 Simple mode Internet fax system	4.1 Simple mode Internet fax system

	This example describes the capabilities of a typical simple mode	This example describes the capabilities of a typical simple mode
	Internet fax system. Note that TIFF application S is required to	Internet fax system. Note that TIFF application S is required to
	be supported by such a system.	be supported by such a system.

	(& (image-file-structure=TIFF-minimal)	(& (image-file-structure=TIFF-minimal)
	(MRC-mode=0)	(MRC-mode=0)
	(color=Binary)	(color=Binary)

	skipping to change at page 15, line 5 ¶	skipping to change at page 15, line 5 ¶
	(& (dpi=200) (dpi-xyratio=[200/100,1]) )	(& (dpi=200) (dpi-xyratio=[200/100,1]) )
	(& (dpi=300) (dpi-xyratio=1) ) )	(& (dpi=300) (dpi-xyratio=1) ) )
	(\| (image-coding=[MH,MR,MMR])	(\| (image-coding=[MH,MR,MMR])
	(& (image-coding=JBIG)	(& (image-coding=JBIG)
	(image-coding-constraint=JBIG-T85)	(image-coding-constraint=JBIG-T85)
	(JBIG-stripe-size=128) ) )	(JBIG-stripe-size=128) ) )
	(size-x<=2150/254)	(size-x<=2150/254)
	(paper-size=[letter,A4,B4]) )	(paper-size=[letter,A4,B4]) )
	(ua-media=stationery) )	(ua-media=stationery) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	4.3 Grey-scale Internet fax system	4.3 Grey-scale Internet fax system

	This is the previous example extended to handle grey scale multi-	This is the previous example extended to handle grey scale multi-
	level images. In keeping with Group 3 fax, this example requires	level images. In keeping with Group 3 fax, this example requires
	equal x- and y- resolutions for a multi-level image.	equal x- and y- resolutions for a multi-level image.

	(& (image-file-structure=TIFF)	(& (image-file-structure=TIFF)
	(MRC-mode=0)	(MRC-mode=0)
	(\| (& (color=Binary)	(\| (& (color=Binary)

	skipping to change at page 16, line 5 ¶	skipping to change at page 16, line 5 ¶
	(image-coding-constraint=JPEG-T4E) )	(image-coding-constraint=JPEG-T4E) )
	(& (image-coding=JBIG)	(& (image-coding=JBIG)
	(image-coding-constraint=JBIG-T43)	(image-coding-constraint=JBIG-T43)
	(JBIG-stripe-size=128)	(JBIG-stripe-size=128)
	(image-interleave=stripe) ) )	(image-interleave=stripe) ) )
	(dpi=[100,200,300]) (dpi-xyratio=1) ) )	(dpi=[100,200,300]) (dpi-xyratio=1) ) )
	(size-x<=2150/254)	(size-x<=2150/254)
	(paper-size=[letter,A4,B4]) )	(paper-size=[letter,A4,B4]) )
	(ua-media=stationery) )	(ua-media=stationery) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	4.4 Full-color Internet fax system (JPEG only)	4.4 Full-color Internet fax system (JPEG only)

	This adds 24-bit full-color to the previous example.	This adds 24-bit full-color to the previous example.

	(& (image-file-structure=TIFF)	(& (image-file-structure=TIFF)
	(MRC-mode=0)	(MRC-mode=0)
	(\| (& (color=Binary)	(\| (& (color=Binary)
	(image-coding=[MH,MR,MMR])	(image-coding=[MH,MR,MMR])
	(\| (& (dpi=204) (dpi-xyratio=[204/98,204/196]) )	(\| (& (dpi=204) (dpi-xyratio=[204/98,204/196]) )

	skipping to change at page 17, line 5 ¶	skipping to change at page 17, line 5 ¶
	(CIELAB-L-max<=100)	(CIELAB-L-max<=100)
	(CIELAB-a-min>=-85)	(CIELAB-a-min>=-85)
	(CIELAB-a-max<=85)	(CIELAB-a-max<=85)
	(CIELAB-b-min>=-75)	(CIELAB-b-min>=-75)
	(CIELAB-b-max<=125)	(CIELAB-b-max<=125)
	(dpi=[100,200,300]) (dpi-xyratio=1) ) )	(dpi=[100,200,300]) (dpi-xyratio=1) ) )
	(size-x<=2150/254)	(size-x<=2150/254)
	(paper-size=[letter,A4,B4]) )	(paper-size=[letter,A4,B4]) )
	(ua-media=stationery) )	(ua-media=stationery) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	4.5 Full-color Internet fax system (JPEG and JBIG)	4.5 Full-color Internet fax system (JPEG and JBIG)

	This adds limited CMY(K), RGB and 16-bit mapped color using JBIG	This adds limited CMY(K), RGB and 16-bit mapped color using JBIG
	coding to the previous example.	coding to the previous example.

	(& (image-file-structure=TIFF)	(& (image-file-structure=TIFF)
	(MRC-mode=0)	(MRC-mode=0)
	(\| (& (color=Binary)	(\| (& (color=Binary)
	(\| (image-coding=[MH,MR,MMR])	(\| (image-coding=[MH,MR,MMR])

	skipping to change at page 18, line 5 ¶	skipping to change at page 18, line 5 ¶
	(\| (& (image-coding=JPEG)	(\| (& (image-coding=JPEG)
	(image-coding-constraint=JPEG-T4E) )	(image-coding-constraint=JPEG-T4E) )
	(& (image-coding=JBIG)	(& (image-coding=JBIG)
	(image-coding-constraint=JBIG-T43)	(image-coding-constraint=JBIG-T43)
	(JBIG-stripe-size=128)	(JBIG-stripe-size=128)
	(image-interleave=stripe) ) )	(image-interleave=stripe) ) )
	(color-levels<=256)	(color-levels<=256)
	(color-space=CIELAB)	(color-space=CIELAB)
	(color-illuminant=D50)	(color-illuminant=D50)


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	(CIELAB-L-min>=0)	(CIELAB-L-min>=0)
	(CIELAB-L-max<=100)	(CIELAB-L-max<=100)
	(dpi=[100,200,300]) (dpi-xyratio=1) )	(dpi=[100,200,300]) (dpi-xyratio=1) )
	(& (color=full)	(& (color=full)
	(\| (& (image-coding=JPEG)	(\| (& (image-coding=JPEG)
	(image-coding-constraint=JPEG-T4E)	(image-coding-constraint=JPEG-T4E)
	(color-subsampling=["1:1:1","4:1:1"]) )	(color-subsampling=["1:1:1","4:1:1"]) )
	(& (image-coding=JBIG)	(& (image-coding=JBIG)
	(image-coding-constraint=JBIG-T43)	(image-coding-constraint=JBIG-T43)

	skipping to change at page 19, line 5 ¶	skipping to change at page 19, line 5 ¶
	(color-levels<=8) ) )	(color-levels<=8) ) )
	(\| (& (color-space=Device-CMYK)	(\| (& (color-space=Device-CMYK)
	(color-levels<=16) ) )	(color-levels<=16) ) )
	(image-coding=JBIG)	(image-coding=JBIG)
	(image-coding-constraint=JBIG-T43)	(image-coding-constraint=JBIG-T43)
	(JBIG-stripe-size=128)	(JBIG-stripe-size=128)
	(image-interleave=stripe)	(image-interleave=stripe)
	(dpi=[100,200,300,400]) (dpi-xyratio=1) )	(dpi=[100,200,300,400]) (dpi-xyratio=1) )
	(& (color=mapped)	(& (color=mapped)


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	(color-levels<=65536)	(color-levels<=65536)
	(image-coding=JBIG)	(image-coding=JBIG)
	(image-coding-constraint=JBIG-T43)	(image-coding-constraint=JBIG-T43)
	(JBIG-stripe-size=128)	(JBIG-stripe-size=128)
	(image-interleave=stripe)	(image-interleave=stripe)
	(color-space=CIELAB)	(color-space=CIELAB)
	(CIELAB-L-min>=0)	(CIELAB-L-min>=0)
	(CIELAB-L-max<=100)	(CIELAB-L-max<=100)
	(CIELAB-a-min>=-85)	(CIELAB-a-min>=-85)

	skipping to change at page 20, line 5 ¶	skipping to change at page 20, line 5 ¶
	(CIELAB-L-max<=100)	(CIELAB-L-max<=100)
	(CIELAB-a-min>=-85)	(CIELAB-a-min>=-85)
	(CIELAB-a-max<=85)	(CIELAB-a-max<=85)
	(CIELAB-b-min>=-75)	(CIELAB-b-min>=-75)
	(CIELAB-b-max<=125)	(CIELAB-b-max<=125)
	(dpi=[100,200,300,400]) (dpi-xyratio=1) ) )	(dpi=[100,200,300,400]) (dpi-xyratio=1) ) )
	(size-x<=2550/254)	(size-x<=2550/254)
	(Paper-size=[Letter,A4,B4])	(Paper-size=[Letter,A4,B4])
	(ua-media=stationery) )	(ua-media=stationery) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	4.7 Sender and receiver feature matching	4.7 Sender and receiver feature matching

	This example considers sending a document to an enhanced black-and-	This example considers sending a document to an enhanced black-and-
	white fax system with the following receiver capabilities:	white fax system with the following receiver capabilities:

	(& (\| (& (dpi=200) (dpi-xyatio=200/100) )	(& (\| (& (dpi=200) (dpi-xyatio=200/100) )
	(& (dpi=200) (dpi-xyratio=1) )	(& (dpi=200) (dpi-xyratio=1) )
	(& (dpi=300) (dpi-xyratio=1) )	(& (dpi=300) (dpi-xyratio=1) )
	(& (dpi=400) (dpi-xyratio=1) ) )	(& (dpi=400) (dpi-xyratio=1) ) )

	skipping to change at page 21, line 5 ¶	skipping to change at page 21, line 5 ¶
	(image-coding=[MMR,JBIG]) )	(image-coding=[MMR,JBIG]) )
	(& (dpi=200) (dpi-xyratio=200/100)	(& (dpi=200) (dpi-xyratio=200/100)
	(color=Binary)	(color=Binary)
	(paper-size=B4)	(paper-size=B4)
	(image-coding=[MH,MR]) )	(image-coding=[MH,MR]) )
	(& (dpi=300) (dpi-xyratio=1)	(& (dpi=300) (dpi-xyratio=1)
	(color=Mapped) (color-levels=42)	(color=Mapped) (color-levels=42)
	(paper-size=A4)	(paper-size=A4)
	(image-coding=JPEG) ) )	(image-coding=JPEG) ) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	This could be simplified, but there is little gain in doing so at	This could be simplified, but there is little gain in doing so at
	this point.	this point.

	The composite document description can be matched with the receiver	The composite document description can be matched with the receiver
	capability description, according to the rules in [2], to yield the	capability description, according to the rules in [2], to yield the
	result:	result:

	(\| (& (dpi=300) (dpi-xyratio=1)	(\| (& (dpi=300) (dpi-xyratio=1)
	(color=Binary)	(color=Binary)

	skipping to change at page 22, line 5 ¶	skipping to change at page 22, line 5 ¶
	o Even though the sender may not understand the 'ua-media' feature	o Even though the sender may not understand the 'ua-media' feature
	tag, and does not mention it, the matching rules preserve the	tag, and does not mention it, the matching rules preserve the
	constraint that the B4 document is rendered with	constraint that the B4 document is rendered with
	'(ua-media=continuous)', and the A4 document may be rendered with	'(ua-media=continuous)', and the A4 document may be rendered with
	'(ua-media=[stationery,transparency])'.	'(ua-media=[stationery,transparency])'.

	Finally, note that when matching an MRC document description, the	Finally, note that when matching an MRC document description, the
	description of each component sub-image must match the capabilities	description of each component sub-image must match the capabilities
	of the intended receiver.	of the intended receiver.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	5. IANA considerations	5. IANA considerations

	Appendix A of this document repeats the descriptions of feature	Appendix A of this document repeats the descriptions of feature
	tags introduced by RFC 2531 [22], with some small revisions. These	tags introduced by RFC 2531 [22], with some small revisions. These
	have been registered in the "IETF tree", according to the procedure	have been registered in the "IETF tree", according to the procedure
	described in section 3.1.1 of "Media Feature Tag Registration	described in section 3.1.1 of "Media Feature Tag Registration
	Procedure" [1] (i.e. these feature tags are subject to the "IETF	Procedure" [1] (i.e. these feature tags are subject to the "IETF
	Consensus" policies described in RFC 2434 [21]).	Consensus" policies described in RFC 2434 [21]).


	skipping to change at page 22, line 39 ¶	skipping to change at page 22, line 39 ¶

	Negotiation mechanisms reveal information about one party to other	Negotiation mechanisms reveal information about one party to other
	parties. This may raise privacy concerns, and may allow a	parties. This may raise privacy concerns, and may allow a
	malicious party to make better guesses about the presence of	malicious party to make better guesses about the presence of
	specific security holes.	specific security holes.

	Most of these concerns pertain to capability information getting	Most of these concerns pertain to capability information getting
	into the hands of someone who may abuse it. This document	into the hands of someone who may abuse it. This document
	specifies capabilities that help a sender to determine what image	specifies capabilities that help a sender to determine what image
	characteristics can be processed by the recipient, not mechanisms	characteristics can be processed by the recipient, not mechanisms

	for their publication. Implementors and users should take care	for their publication. Implementers and users should take care
	that the mechanisms employed ensure that capabilities are revealed	that the mechanisms employed ensure that capabilities are revealed
	only to appropriate persons, systems and agents.	only to appropriate persons, systems and agents.

	6.2 Specific threats	6.2 Specific threats

	1. Unsolicited bulk mail: if it is known that a recipient can	1. Unsolicited bulk mail: if it is known that a recipient can
	process certain types of images, they may be targeted by bulk	process certain types of images, they may be targeted by bulk
	mailers that want to send such images.	mailers that want to send such images.

	7. Acknowledgements	7. Acknowledgements

	The authors gratefully acknowledge the contributions of the	The authors gratefully acknowledge the contributions of the
	following persons who commented on earlier versions of this memo:	following persons who commented on earlier versions of this memo:
	James Rafferty, Dan Wing, Robert Buckley, Mr Ryuji Iwazaki. The	James Rafferty, Dan Wing, Robert Buckley, Mr Ryuji Iwazaki. The
	following contributed ideas upon which some of the features	following contributed ideas upon which some of the features
	described here have been based: Larry Masinter, Al Gilman, Koen	described here have been based: Larry Masinter, Al Gilman, Koen
	Holtman.	Holtman.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	8. References	8. References

	[1] RFC 2506, "Media Feature Tag Registration Procedure"	[1] RFC 2506, "Media Feature Tag Registration Procedure"
	Koen Holtman, TUE	Koen Holtman, TUE
	Andrew Mutz, Hewlett-Packard	Andrew Mutz, Hewlett-Packard
	Ted Hardie, NASA	Ted Hardie, NASA
	March 1999.	March 1999.

	[2] RFC 2533, "A syntax for describing media feature sets"	[2] RFC 2533, "A syntax for describing media feature sets"

	skipping to change at page 23, line 29 ¶	skipping to change at page 23, line 29 ¶

	[3] RFC 2534, "Media Features for Display, Print, and Fax"	[3] RFC 2534, "Media Features for Display, Print, and Fax"
	Larry Masinter, Xerox PARC	Larry Masinter, Xerox PARC
	Koen Holtman, TUE	Koen Holtman, TUE
	Andrew Mutz, Hewlett-Packard	Andrew Mutz, Hewlett-Packard
	Dan Wing, Cisco Systems	Dan Wing, Cisco Systems
	March 1999.	March 1999.

	[4] "Internet fax feature mapping from Group 3 fax"	[4] "Internet fax feature mapping from Group 3 fax"
	Lloyd McIntyre, Xerox Corporation	Lloyd McIntyre, Xerox Corporation

	Graham Klyne, 5GM/Content Technologies	Graham Klyne, Content Technologies
	Internet draft: <draft-ietf-fax-feature-T30-mapping-01.txt>	Internet draft: <draft-ietf-fax-feature-T30-mapping-03.txt>
	Work in progress, June 1999.	Work in progress, January 2000.

	[5] RFC 2532, "Extended Facsimile Using Internet Mail"	[5] RFC 2532, "Extended Facsimile Using Internet Mail"
	Larry Masinter, Xerox Corporation	Larry Masinter, Xerox Corporation
	Dan Wing, Cisco Systems	Dan Wing, Cisco Systems
	March 1999.	March 1999.

	[6] "Procedures for document facsimile transmission in the general	[6] "Procedures for document facsimile transmission in the general
	switched telephone network"	switched telephone network"
	ITU-T Recommendation T.30 (1996)	ITU-T Recommendation T.30 (1996)
	International Telecommunications Union	International Telecommunications Union

	skipping to change at page 24, line 5 ¶	skipping to change at page 24, line 5 ¶

	[7] RFC 2301, "File format for Internet fax"	[7] RFC 2301, "File format for Internet fax"
	L. McIntyre,	L. McIntyre,
	R. Buckley,	R. Buckley,
	D. Venable, Xerox Corporation	D. Venable, Xerox Corporation
	S. Zilles, Adobe Systems, Inc.	S. Zilles, Adobe Systems, Inc.
	G. Parsons, Northern Telecom	G. Parsons, Northern Telecom
	J. Rafferty, Human Communications	J. Rafferty, Human Communications
	March 1998.	March 1998.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	[8] RFC 2305, "A Simple Mode of Facsimile Using Internet Mail"	[8] RFC 2305, "A Simple Mode of Facsimile Using Internet Mail"
	K. Toyoda	K. Toyoda
	H. Ohno	H. Ohno
	J. Murai, WIDE Project	J. Murai, WIDE Project
	D. Wing, Cisco Systems	D. Wing, Cisco Systems
	March 1998.	March 1998.

	[9] "Continuous-tone color representation method for facsimile"	[9] "Continuous-tone color representation method for facsimile"
	ITU-T Recommendation T.42 (1996)	ITU-T Recommendation T.42 (1996)

	skipping to change at page 24, line 28 ¶	skipping to change at page 24, line 28 ¶
	(Covers custom illuminant, gamut)	(Covers custom illuminant, gamut)

	[10] "Colour and gray-scale image representation using lossless coding	[10] "Colour and gray-scale image representation using lossless coding
	scheme for facsimile"	scheme for facsimile"
	ITU-T Recommendation T.43 (1997)	ITU-T Recommendation T.43 (1997)
	International Telecommunications Union.	International Telecommunications Union.
	(Covers JBIG for colour/grey images)	(Covers JBIG for colour/grey images)

	[11] (Reference deleted)	[11] (Reference deleted)


	[12] "Requirements for protocol-independent content negotiation"	[12] RFC 2703, "Protocol-independent Content Negotiation Framework"
	G. Klyne, 5GM/Content Technologies	Graham Klyne, 5GM/Content Technologies
	Internet draft: <draft-ietf-conneg-requirements-02.txt>	September 1999.
	Work in progress, March 1999.

	[13] "Standardization of Group 3 facsimile terminals for document	[13] "Standardization of Group 3 facsimile terminals for document
	transmission"	transmission"
	ITU-T Recommendation T.4 (1996)	ITU-T Recommendation T.4 (1996)
	International Telecommunications Union	International Telecommunications Union
	(Covers basic fax coding formats: MH, MR)	(Covers basic fax coding formats: MH, MR)

	[14] "Facsimile coding schemes and coding control functions for	[14] "Facsimile coding schemes and coding control functions for
	Group 4 facsimile apparatus"	Group 4 facsimile apparatus"
	ITU Recommendation T.6	ITU Recommendation T.6

	skipping to change at page 25, line 5 ¶	skipping to change at page 25, line 5 ¶
	[15] "Mixed Raster Content (MRC)"	[15] "Mixed Raster Content (MRC)"
	ITU-T Recommendation T.44	ITU-T Recommendation T.44
	International Telecommunications Union	International Telecommunications Union

	[16] "Information technology - Digital compression and coding of	[16] "Information technology - Digital compression and coding of
	continuous-tone still image - Requirements and guidelines"	continuous-tone still image - Requirements and guidelines"
	ITU-T Recommendation T.81 (1992) \| ISO/IEC 10918-1:1993	ITU-T Recommendation T.81 (1992) \| ISO/IEC 10918-1:1993
	International Telecommunications Union	International Telecommunications Union
	(Commonly referred to as JPEG standard)	(Commonly referred to as JPEG standard)


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	[17] "Information technology - Coded representation of picture and	[17] "Information technology - Coded representation of picture and
	audio information - Progressive bi-level image compression"	audio information - Progressive bi-level image compression"
	ITU-T Recommendation T.82 (1993) \| ISO/IEC 11544:1993	ITU-T Recommendation T.82 (1993) \| ISO/IEC 11544:1993
	International Telecommunications Union	International Telecommunications Union
	(Commonly referred to as JBIG1 standard)	(Commonly referred to as JBIG1 standard)

	[18] "Application profile for Recommendation T.82 - Progressive bi-	[18] "Application profile for Recommendation T.82 - Progressive bi-
	level image compression (JBIG1 coding scheme for facsimile	level image compression (JBIG1 coding scheme for facsimile
	apparatus)"	apparatus)"

	skipping to change at page 26, line 5 ¶	skipping to change at page 25, line 44 ¶
	in RFCs"	in RFCs"
	T. Narten, IBM	T. Narten, IBM
	H. Alvestrand, Maxware	H. Alvestrand, Maxware
	October 1998.	October 1998.

	[22] RFC 2531, "Content feature schema for Internet fax"	[22] RFC 2531, "Content feature schema for Internet fax"
	Graham Klyne, 5GM/Content Technologies	Graham Klyne, 5GM/Content Technologies
	Lloyd McIntyre, Xerox Corporation	Lloyd McIntyre, Xerox Corporation
	March 1999.	March 1999.


	Internet Draft Content feature schema for Internet fax
	10 August 1999

	9. Authors' addresses	9. Authors' addresses

	Graham Klyne	Graham Klyne

	5th Generation Messaging Ltd. Content Technologies Ltd.	Content Technologies Ltd.
	5 Watlington Street Forum 1, Station Road	1220 Parkview,
	Nettlebed Theale	Arlington Business Park
	Henley-on-Thames, RG9 5AB Reading, RG7 4RA	Theale
	United Kingdom United Kingdom.	Reading, RG7 4SA
	Telephone: +44 1491 641 641 +44 118 930 1300	United Kingdom.
	Facsimile: +44 1491 641 611 +44 118 930 1301	Telephone: +44 118 930 1300
	E-mail: GK@ACM.ORG	Facsimile: +44 118 930 1301
		E-mail: GK@ACM.ORG

		Internet Draft Content Feature Schema for Internet Fax (V2)
		5 January

	Lloyd McIntyre	Lloyd McIntyre
	Xerox Corporation	Xerox Corporation
	Mailstop PAHV-121	Mailstop PAHV-121
	3400 Hillview Ave.	3400 Hillview Ave.
	Palo Alto, CA 94304 USA	Palo Alto, CA 94304 USA
	Telephone: +1-650-813-6762	Telephone: +1-650-813-6762
	Facsimile: +1-650-845-2340	Facsimile: +1-650-845-2340
	E-mail: Lloyd.McIntyre@pahv.xerox.com	E-mail: Lloyd.McIntyre@pahv.xerox.com


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	Appendix A: Feature registrations	Appendix A: Feature registrations

	A.1 Image size	A.1 Image size

	- Media Feature tag name(s):	- Media Feature tag name(s):

	size-x	size-x
	size-y	size-y


	skipping to change at page 28, line 5 ¶	skipping to change at page 28, line 5 ¶
	will be made depending on the size of the recipient device.	will be made depending on the size of the recipient device.

	- Examples of typical use:	- Examples of typical use:

	This example describes the maximum scanned image width and	This example describes the maximum scanned image width and
	height for Group 3 fax: 215x297 mm (8.46x11.69 inches):	height for Group 3 fax: 215x297 mm (8.46x11.69 inches):

	(size-x<=2150/254)	(size-x<=2150/254)
	(size-y<=2970/254)	(size-y<=2970/254)


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	- Related standards or documents:	- Related standards or documents:

	The memo "Media Features for Display, Print, and Fax" [3]	The memo "Media Features for Display, Print, and Fax" [3]
	describes features (pix-x, pix-y) for measuring document size	describes features (pix-x, pix-y) for measuring document size
	in pixels.	in pixels.

	Fax applications should declare physical dimensions using the	Fax applications should declare physical dimensions using the
	features defined here.	features defined here.


	skipping to change at page 29, line 5 ¶	skipping to change at page 29, line 5 ¶
	dpi-xyratio [this document]	dpi-xyratio [this document]

	- Intended usage:	- Intended usage:

	Common	Common

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	A.2 Resolution aspect ratio	A.2 Resolution aspect ratio

	- Media Feature tag name(s):	- Media Feature tag name(s):

	dpi-xyratio	dpi-xyratio

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.9	1.3.6.1.8.1.9

	skipping to change at page 30, line 5 ¶	skipping to change at page 30, line 5 ¶
	The following example describes a fax resolution of 204 dpi	The following example describes a fax resolution of 204 dpi
	horizontally by 391 dpi vertically:	horizontally by 391 dpi vertically:

	(& (dpi=204) (dpi-xyratio=204/391) )	(& (dpi=204) (dpi-xyratio=204/391) )

	- Related standards or documents:	- Related standards or documents:

	The memo "Media Features for Display, Print, and Fax" [3]	The memo "Media Features for Display, Print, and Fax" [3]
	describes a feature (dpi) for measuring document resolution.	describes a feature (dpi) for measuring document resolution.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Interoperability considerations:	- Interoperability considerations:

	When interoperating with an application that does not	When interoperating with an application that does not
	recognize the differential resolution feature, resolution	recognize the differential resolution feature, resolution
	matching may be performed on the basis of the horizontal	matching may be performed on the basis of the horizontal
	resolution only, so aspect ratio information may be lost.	resolution only, so aspect ratio information may be lost.

	- Related feature tags:	- Related feature tags:


	skipping to change at page 31, line 5 ¶	skipping to change at page 31, line 5 ¶
	size-y [this document]	size-y [this document]

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.3 Color levels	A.3 Color levels

	- Media Feature tag name(s):	- Media Feature tag name(s):

	color-levels	color-levels

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.10	1.3.6.1.8.1.10

	- Summary of the media features indicated:	- Summary of the media features indicated:

	This feature tag is used to indicate a number of different	This feature tag is used to indicate a number of different
	image data pixel color values.	image data pixel color values.


	When mapped (palettized) color is used, this is generally	When mapped (palletized) color is used, this is generally
	different from the number of different colors that can be	different from the number of different colors that can be
	represented through the color mapping function.	represented through the color mapping function.

	This feature tag is used in conjunction with a 'color' feature	This feature tag is used in conjunction with a 'color' feature
	having a value other than 'Binary'.	having a value other than 'Binary'.

	- Values appropriate for use with this feature tag:	- Values appropriate for use with this feature tag:

	Integer (>=2)	Integer (>=2)


	skipping to change at page 32, line 5 ¶	skipping to change at page 32, line 5 ¶
	(& (color=grey) (color-levels<=64) )	(& (color=grey) (color-levels<=64) )
	(& (color=mapped) (color-levels<=240) )	(& (color=mapped) (color-levels<=240) )
	(& (color=full) (color-levels<=16777216) )	(& (color=full) (color-levels<=16777216) )

	To describe capabilities used by a document:	To describe capabilities used by a document:
	(& (color=limited) (color-levels=4) )	(& (color=limited) (color-levels=4) )
	(& (color=grey) (color-levels=48) )	(& (color=grey) (color-levels=48) )
	(& (color=mapped) (color-levels=100) )	(& (color=mapped) (color-levels=100) )
	(& (color=full) (color-levels=32768) )	(& (color=full) (color-levels=32768) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Related standards or documents:	- Related standards or documents:

	The memo "Media Features for Display, Print, and Fax" [3]	The memo "Media Features for Display, Print, and Fax" [3]
	describes a feature (color) for indicating basic color	describes a feature (color) for indicating basic color
	capabilities.	capabilities.

	- Interoperability considerations:	- Interoperability considerations:

	The actual number of color values used by a document does not,	The actual number of color values used by a document does not,

	skipping to change at page 33, line 5 ¶	skipping to change at page 33, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.4 Color space	A.4 Color space

	- Media Feature tag name(s):	- Media Feature tag name(s):

	color-space	color-space

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.11	1.3.6.1.8.1.11

	skipping to change at page 34, line 5 ¶	skipping to change at page 34, line 5 ¶

	Calibrated color CIELAB (per T.42 [9])	Calibrated color CIELAB (per T.42 [9])
	space:	space:

	(may be extended by further registrations)	(may be extended by further registrations)

	'Color-space=CIELAB' indicates the CIE Lab* colour space,	'Color-space=CIELAB' indicates the CIE Lab* colour space,
	using CIED50 illuminant and its perfectly diffuse reflecting	using CIED50 illuminant and its perfectly diffuse reflecting
	white point (per T.42 [9]).	white point (per T.42 [9]).


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- The feature tag is intended primarily for use in the following	- The feature tag is intended primarily for use in the following
	applications, protocols, services, or negotiation mechanisms:	applications, protocols, services, or negotiation mechanisms:

	Color image printing and display applications where the data	Color image printing and display applications where the data
	resource used may depend upon color handling capabilities of	resource used may depend upon color handling capabilities of
	the recipient.	the recipient.

	Scanning applications where the data transferred may depend	Scanning applications where the data transferred may depend
	upon the image generation capabilities of the originator.	upon the image generation capabilities of the originator.

	skipping to change at page 35, line 5 ¶	skipping to change at page 35, line 5 ¶
	device color space (color-space=Device-xxx) should be	device color space (color-space=Device-xxx) should be
	indicated.	indicated.

	Documents for which exact color matching is not important	Documents for which exact color matching is not important
	should indicate a device color space capability, if	should indicate a device color space capability, if
	applicable.	applicable.

	These principles allow sender/receiver feature matching to be	These principles allow sender/receiver feature matching to be
	achieved when exact color matching is not required.	achieved when exact color matching is not required.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Security considerations:	- Security considerations:

	- Privacy concerns, related to exposure of personal information:	- Privacy concerns, related to exposure of personal information:
	Where feature matching is used to select content applicable	Where feature matching is used to select content applicable
	to the physical abilities of a user, unusual values for this	to the physical abilities of a user, unusual values for this
	feature tag might give an indication of a user's restricted	feature tag might give an indication of a user's restricted
	abilities.	abilities.

	- Denial of service concerns related to consequences of	- Denial of service concerns related to consequences of

	skipping to change at page 36, line 5 ¶	skipping to change at page 36, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.5 CIELAB color illuminant	A.5 CIELAB color illuminant

	- Media Feature tag name(s):	- Media Feature tag name(s):

	color-illuminant	color-illuminant

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	[[[New IANA-allocated value]]]	[[[New IANA-allocated value]]]

	skipping to change at page 37, line 5 ¶	skipping to change at page 37, line 5 ¶
	- The feature tag is intended primarily for use in the following	- The feature tag is intended primarily for use in the following
	applications, protocols, services, or negotiation mechanisms:	applications, protocols, services, or negotiation mechanisms:

	Color image printing and display applications where the data	Color image printing and display applications where the data
	resource used may depend upon detailed color handling	resource used may depend upon detailed color handling
	capabilities of the recipient.	capabilities of the recipient.

	Scanning applications where the data transferred may depend	Scanning applications where the data transferred may depend
	upon the image generation capabilities of the originator.	upon the image generation capabilities of the originator.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Examples of typical use:	- Examples of typical use:

	To describe rendering or scanning capabilities, or to describe	To describe rendering or scanning capabilities, or to describe
	capabilities assumed by a document for which exact color	capabilities assumed by a document for which exact color
	handling capabilities are required:	handling capabilities are required:

	(& (color-space=CIELAB) (color-illuminant=D50) )	(& (color-space=CIELAB) (color-illuminant=D50) )

	- Related standards or documents:	- Related standards or documents:

	skipping to change at page 37, line 28 ¶	skipping to change at page 37, line 28 ¶
	CIELAB color illuminant representations are described in ITU	CIELAB color illuminant representations are described in ITU
	T.4 [13], Annex E.6.7.	T.4 [13], Annex E.6.7.

	- Interoperability considerations:	- Interoperability considerations:

	A color-handling receiver that supports a calibrated color	A color-handling receiver that supports a calibrated color
	space should indicate any constraint on the illuminants it can	space should indicate any constraint on the illuminants it can
	handle.	handle.

	In the absence of a color-illuminant constraint, a receiver is	In the absence of a color-illuminant constraint, a receiver is

	presumed to accept and deal with any specified illuminat	presumed to accept and deal with any specified illuminant
	value.	value.

	- Related feature tags:	- Related feature tags:

	color [3]	color [3]
	color-space [this document]	color-space [this document]

	- Related media types or data formats:	- Related media types or data formats:

	TIFF-FX [7]	TIFF-FX [7]

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.6 CIELAB color depth	A.6 CIELAB color depth

	- Media Feature tag name(s):	- Media Feature tag name(s):

	CIELAB-L-depth	CIELAB-L-depth
	CIELAB-a-depth	CIELAB-a-depth
	CIELAB-b-depth	CIELAB-b-depth

	- ASN.1 identifiers associated with these feature tags:	- ASN.1 identifiers associated with these feature tags:

	skipping to change at page 39, line 5 ¶	skipping to change at page 39, line 5 ¶
	following applications, protocols, services, or negotiation	following applications, protocols, services, or negotiation
	mechanisms:	mechanisms:

	Color image printing and display applications where the data	Color image printing and display applications where the data
	resource used may depend upon color handling capabilities of	resource used may depend upon color handling capabilities of
	the recipient.	the recipient.

	Scanning applications where the data transferred may depend	Scanning applications where the data transferred may depend
	upon the image generation capabilities of the originator.	upon the image generation capabilities of the originator.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Examples of typical use:	- Examples of typical use:

	To describe rendering or scanning capabilities:	To describe rendering or scanning capabilities:

	(& (color=mapped) (color-levels<=240)	(& (color=mapped) (color-levels<=240)
	(CIELAB-L-depth<=128)	(CIELAB-L-depth<=128)
	(CIELAB-a-depth<=128)	(CIELAB-a-depth<=128)
	(CIELAB-b-depth<=128) )	(CIELAB-b-depth<=128) )
	(& (color=full) (color-levels<=16777216)	(& (color=full) (color-levels<=16777216)

	skipping to change at page 40, line 5 ¶	skipping to change at page 40, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.7 CIELAB color gamut	A.7 CIELAB color gamut

	- Media Feature tag name(s):	- Media Feature tag name(s):

	CIELAB-L-min	CIELAB-L-min
	CIELAB-L-max	CIELAB-L-max
	CIELAB-a-min	CIELAB-a-min
	CIELAB-a-max	CIELAB-a-max
	CIELAB-b-min	CIELAB-b-min

	skipping to change at page 41, line 5 ¶	skipping to change at page 41, line 5 ¶

	- ASN.1 identifiers associated with these feature tags:	- ASN.1 identifiers associated with these feature tags:

	CIELAB-L-min: 1.3.6.1.8.1.15	CIELAB-L-min: 1.3.6.1.8.1.15
	CIELAB-L-max: 1.3.6.1.8.1.16	CIELAB-L-max: 1.3.6.1.8.1.16
	CIELAB-a-min: 1.3.6.1.8.1.17	CIELAB-a-min: 1.3.6.1.8.1.17
	CIELAB-a-max: 1.3.6.1.8.1.18	CIELAB-a-max: 1.3.6.1.8.1.18
	CIELAB-b-min: 1.3.6.1.8.1.19	CIELAB-b-min: 1.3.6.1.8.1.19
	CIELAB-b-max: 1.3.6.1.8.1.20	CIELAB-b-max: 1.3.6.1.8.1.20


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Summary of the media features indicated:	- Summary of the media features indicated:

	These feature indicate a supported range of color values, by	These feature indicate a supported range of color values, by
	indicating minimum and maximum values used for each color	indicating minimum and maximum values used for each color
	component in a CIELAB color space.	component in a CIELAB color space.

	'CIELAB-L-min' and 'CIELAB-L-max' are the minimum and maximum	'CIELAB-L-min' and 'CIELAB-L-max' are the minimum and maximum
	values of the L* component.	values of the L* component.


	skipping to change at page 42, line 5 ¶	skipping to change at page 42, line 5 ¶
	applications, protocols, services, or negotiation mechanisms:	applications, protocols, services, or negotiation mechanisms:

	Color image printing and display applications where the data	Color image printing and display applications where the data
	resource used may depend upon detailed color handling	resource used may depend upon detailed color handling
	capabilities of the recipient.	capabilities of the recipient.

	Scanning applications where the data transferred may depend	Scanning applications where the data transferred may depend
	upon the detailed color image generation capabilities of the	upon the detailed color image generation capabilities of the
	originator.	originator.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Examples of typical use:	- Examples of typical use:

	To describe rendering or scanning capabilities:	To describe rendering or scanning capabilities:

	(& (CIELAB-L-min>=0)	(& (CIELAB-L-min>=0)
	(CIELAB-L-max<=100)	(CIELAB-L-max<=100)
	(CIELAB-a-min>=-75)	(CIELAB-a-min>=-75)
	(CIELAB-a-max<=+75)	(CIELAB-a-max<=+75)
	(CIELAB-b-min>=-85)	(CIELAB-b-min>=-85)

	skipping to change at page 43, line 5 ¶	skipping to change at page 43, line 5 ¶
	Where feature matching is used to select content applicable	Where feature matching is used to select content applicable
	to the physical abilities of a user, unusual values for this	to the physical abilities of a user, unusual values for this
	feature tag might give an indication of a user's restricted	feature tag might give an indication of a user's restricted
	abilities.	abilities.

	- Related feature tags:	- Related feature tags:

	color [3]	color [3]
	color-space [this document]	color-space [this document]


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Related media types or data formats:	- Related media types or data formats:

	TIFF-FX [7]	TIFF-FX [7]

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.8 Image file structure	A.8 Image file structure

	- Media Feature tag name(s):	- Media Feature tag name(s):

	image-file-structure	image-file-structure

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.21	1.3.6.1.8.1.21

	skipping to change at page 45, line 5 ¶	skipping to change at page 45, line 5 ¶

	- Considerations particular to use in individual applications,	- Considerations particular to use in individual applications,
	protocols, services, or negotiation mechanisms:	protocols, services, or negotiation mechanisms:

	This tag is intended to provide information about an image	This tag is intended to provide information about an image
	file structure. Information about image data coding is	file structure. Information about image data coding is
	provided by other tags.	provided by other tags.

	The following tag values are defined here:	The following tag values are defined here:


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	o 'TIFF' indicates image data enclosed and tagged using TIFF	o 'TIFF' indicates image data enclosed and tagged using TIFF
	structures described in Adobe's definition of TIFF [20].	structures described in Adobe's definition of TIFF [20].

	o 'TIFF-limited' indicates image data structured using TIFF,	o 'TIFF-limited' indicates image data structured using TIFF,
	but with limitations on the placement of Image File	but with limitations on the placement of Image File
	Descriptors (IFDs) within the file, which are indicated in	Descriptors (IFDs) within the file, which are indicated in
	section 4.4.6 of RFC 2301 [7].	section 4.4.6 of RFC 2301 [7].

	o 'TIFF-minimal' indicates a TIFF image format that meets the	o 'TIFF-minimal' indicates a TIFF image format that meets the

	skipping to change at page 46, line 5 ¶	skipping to change at page 46, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Image scanning/rendering applications	Image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.9 Image data coding	A.9 Image data coding

	- Media Feature tag name(s):	- Media Feature tag name(s):

	image-coding	image-coding

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.22	1.3.6.1.8.1.22

	skipping to change at page 47, line 5 ¶	skipping to change at page 47, line 5 ¶

	- The feature tag is intended primarily for use in the following	- The feature tag is intended primarily for use in the following
	applications, protocols, services, or negotiation mechanisms:	applications, protocols, services, or negotiation mechanisms:

	Internet fax, and other applications that transfer image data.	Internet fax, and other applications that transfer image data.

	- Examples of typical use:	- Examples of typical use:

	See Appendix B of this memo.	See Appendix B of this memo.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Related standards or documents:	- Related standards or documents:

	MH, MR: ITU T.4 [13]	MH, MR: ITU T.4 [13]
	MMR: ITU T.6 [14]	MMR: ITU T.6 [14]
	JPEG: ITU T.81 [16]	JPEG: ITU T.81 [16]
	JBIG: ITU T.82 [17]	JBIG: ITU T.82 [17]

	- Interoperability considerations:	- Interoperability considerations:


	skipping to change at page 48, line 5 ¶	skipping to change at page 48, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Image scanning/rendering applications	Image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.10 Image coding constraint	A.10 Image coding constraint

	- Media Feature tag name(s):	- Media Feature tag name(s):

	image-coding-constraint	image-coding-constraint

	- ASN.1 identifier associated with these feature tags:	- ASN.1 identifier associated with these feature tags:

	1.3.6.1.8.1.23	1.3.6.1.8.1.23

	skipping to change at page 49, line 5 ¶	skipping to change at page 49, line 5 ¶
	- Examples of typical use:	- Examples of typical use:

	See Appendix B of this memo.	See Appendix B of this memo.

	- Related standards or documents:	- Related standards or documents:

	JBIG-T85: ITU T.85 [18]	JBIG-T85: ITU T.85 [18]
	JBIG-T43: ITU T.43 [10]	JBIG-T43: ITU T.43 [10]
	JPEG-T4E: ITU T.4 Annex E [13]	JPEG-T4E: ITU T.4 Annex E [13]


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Interoperability considerations:	- Interoperability considerations:

	To establish the correct conditions for interoperability	To establish the correct conditions for interoperability
	between systems, capabilities to handle the generic image	between systems, capabilities to handle the generic image
	coding technique and the specific image coding constraints	coding technique and the specific image coding constraints
	must be established.	must be established.

	- Related feature tags:	- Related feature tags:


	skipping to change at page 50, line 5 ¶	skipping to change at page 50, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.11 JBIG stripe size	A.11 JBIG stripe size

	- Media Feature tag name(s):	- Media Feature tag name(s):

	JBIG-stripe-size	JBIG-stripe-size

	- ASN.1 identifier associated with these feature tags:	- ASN.1 identifier associated with these feature tags:

	1.3.6.1.8.1.24	1.3.6.1.8.1.24

	skipping to change at page 51, line 5 ¶	skipping to change at page 51, line 5 ¶

	(JBIG-stripe-size=128)	(JBIG-stripe-size=128)
	(JBIG-stripe-size>0)	(JBIG-stripe-size>0)

	- Related standards or documents:	- Related standards or documents:

	JBIG: ITU T.82 [17]	JBIG: ITU T.82 [17]
	JBIG-T85: ITU T.85 [18]	JBIG-T85: ITU T.85 [18]
	JBIG-T43: ITU T.43 [10]	JBIG-T43: ITU T.43 [10]


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Considerations particular to use in individual applications,	- Considerations particular to use in individual applications,
	protocols, services, or negotiation mechanisms:	protocols, services, or negotiation mechanisms:

	In the case of Internet fax, the specific constraints allowed	In the case of Internet fax, the specific constraints allowed
	for a receiver are those given as examples above.	for a receiver are those given as examples above.

	Specifying a stripe size that is not limited (JBIG-stripe-	Specifying a stripe size that is not limited (JBIG-stripe-
	size>0) means that an entire page of image data is encoded as	size>0) means that an entire page of image data is encoded as
	a single unit. This may place considerable demands on the	a single unit. This may place considerable demands on the

	skipping to change at page 52, line 5 ¶	skipping to change at page 52, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.12 Image interleave	A.12 Image interleave

	- Media Feature tag name(s):	- Media Feature tag name(s):

	image-interleave	image-interleave

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.25	1.3.6.1.8.1.25

	skipping to change at page 53, line 5 ¶	skipping to change at page 53, line 5 ¶

	- Related feature tags:	- Related feature tags:

	image-coding [this document]	image-coding [this document]
	JBIG-stripe-size [this document]	JBIG-stripe-size [this document]

	- Related media types or data formats:	- Related media types or data formats:

	TIFF-FX [7]	TIFF-FX [7]


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.13 Color subsampling	A.13 Color subsampling

	- Media Feature tag name(s):	- Media Feature tag name(s):

	color-subsampling	color-subsampling

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.26	1.3.6.1.8.1.26

	skipping to change at page 55, line 5 ¶	skipping to change at page 55, line 5 ¶
	the recipient.	the recipient.

	Scanning applications where the data transferred may depend	Scanning applications where the data transferred may depend
	upon the image generation capabilities of the originator.	upon the image generation capabilities of the originator.

	- Examples of typical use:	- Examples of typical use:

	(& (color=full) (color-space=[LAB,CIELAB])	(& (color=full) (color-space=[LAB,CIELAB])
	(color-subsampling=["1:1:1","4:1:1"]) )	(color-subsampling=["1:1:1","4:1:1"]) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Related feature tags:	- Related feature tags:

	color [3]	color [3]
	color-space [this document]	color-space [this document]
	image-file-structure [this document]	image-file-structure [this document]

	- Related media types or data formats:	- Related media types or data formats:

	TIFF-FX [7]	TIFF-FX [7]

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.14 MRC availability and mode	A.14 MRC availability and mode

	- Media Feature tag name(s):	- Media Feature tag name(s):

	MRC-mode	MRC-mode

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.27	1.3.6.1.8.1.27

	skipping to change at page 57, line 5 ¶	skipping to change at page 57, line 5 ¶

	- The feature tag is intended primarily for use in the following	- The feature tag is intended primarily for use in the following
	applications, protocols, services, or negotiation mechanisms:	applications, protocols, services, or negotiation mechanisms:

	Internet fax, and other applications that transfer image data.	Internet fax, and other applications that transfer image data.

	- Examples of typical use:	- Examples of typical use:

	See Appendix B of this document.	See Appendix B of this document.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	- Related standards or documents:	- Related standards or documents:

	ITU T.44 [15]	ITU T.44 [15]

	- Interoperability considerations:	- Interoperability considerations:

	To establish the correct conditions for interoperability	To establish the correct conditions for interoperability
	between systems, capabilities to handle the MRC mode and any	between systems, capabilities to handle the MRC mode and any
	contained image coding techniques must be established.	contained image coding techniques must be established.

	skipping to change at page 58, line 5 ¶	skipping to change at page 58, line 5 ¶

	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	A.15 MRC maximum stripe size	A.15 MRC maximum stripe size

	- Media Feature tag name(s):	- Media Feature tag name(s):

	MRC-max-stripe-size	MRC-max-stripe-size

	- ASN.1 identifier associated with this feature tag:	- ASN.1 identifier associated with this feature tag:

	1.3.6.1.8.1.28	1.3.6.1.8.1.28

	skipping to change at page 59, line 5 ¶	skipping to change at page 59, line 5 ¶
	are those given as examples above.	are those given as examples above.

	- Related feature tags:	- Related feature tags:

	MRC-mode [this document]	MRC-mode [this document]

	- Related media types or data formats:	- Related media types or data formats:

	TIFF-FX [7]	TIFF-FX [7]


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	- Intended usage:	- Intended usage:

	Internet fax	Internet fax
	Color image scanning/rendering applications	Color image scanning/rendering applications

	- Author/Change controller:	- Author/Change controller:

	IETF	IETF


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	Appendix B: TIFF mode descriptions	Appendix B: TIFF mode descriptions

	This appendix contains descriptions of the TIFF modes defined by	This appendix contains descriptions of the TIFF modes defined by
	RFC 2301 [7], presented as feature set expressions in the form	RFC 2301 [7], presented as feature set expressions in the form
	defined by "A syntax for describing media feature sets" [2] and	defined by "A syntax for describing media feature sets" [2] and
	using the feature schema introduced by this document.	using the feature schema introduced by this document.

	These may be taken as illustrations of the feature set combinations	These may be taken as illustrations of the feature set combinations
	that are required for the corresponding TIFF profiles described by	that are required for the corresponding TIFF profiles described by

	skipping to change at page 61, line 5 ¶	skipping to change at page 61, line 5 ¶
	(color=Binary)	(color=Binary)
	(image-coding=MH) (MRC-mode=0)	(image-coding=MH) (MRC-mode=0)
	(\| (& (dpi=200)	(\| (& (dpi=200)
	(dpi-xyratio=[200/100,200/200])	(dpi-xyratio=[200/100,200/200])
	(size-x=1728/200) )	(size-x=1728/200) )
	(& (dpi=204)	(& (dpi=204)
	(dpi-xyratio=[204/98,204/196]	(dpi-xyratio=[204/98,204/196]
	(size-x=1728/204) ) )	(size-x=1728/204) ) )
	(paper-size=A4) )	(paper-size=A4) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	(TIFF-F-base) :-	(TIFF-F-base) :-
	(& (image-file-structure=TIFF-F)	(& (image-file-structure=TIFF-F)
	(color=Binary)	(color=Binary)
	(image-coding=MH) (MRC-mode=0)	(image-coding=MH) (MRC-mode=0)
	(dpi=204)	(dpi=204)
	(dpi-xyratio=[204/98,204/196])	(dpi-xyratio=[204/98,204/196])
	(size-x=1728/204)	(size-x=1728/204)
	(paper-size=A4) )	(paper-size=A4) )


	skipping to change at page 62, line 5 ¶	skipping to change at page 62, line 5 ¶
	(dpi-xyratio=300/300)	(dpi-xyratio=300/300)
	(size-x=[2592/300,3072/300,3648/300]) )	(size-x=[2592/300,3072/300,3648/300]) )
	(& (dpi=400)	(& (dpi=400)
	(dpi-xyratio=400/400)	(dpi-xyratio=400/400)
	(size-x=[3456/400,4096/400,4864/400]) )	(size-x=[3456/400,4096/400,4864/400]) )
	(& (dpi=408)	(& (dpi=408)
	(dpi-xyratio=408/391)	(dpi-xyratio=408/391)
	(size-x=[3456/408,4096/408,4864/408]) ) )	(size-x=[3456/408,4096/408,4864/408]) ) )
	(paper-size=[A4, B4, A3, letter, legal]) )	(paper-size=[A4, B4, A3, letter, legal]) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	(TIFF-J-base) :-	(TIFF-J-base) :-
	(& (image-file-structure=TIFF-J)	(& (image-file-structure=TIFF-J)
	(color=Binary)	(color=Binary)
	(MRC-mode=0)	(MRC-mode=0)
	(image-coding=JBIG)	(image-coding=JBIG)
	(image-coding-constraint=JBIG-T85)	(image-coding-constraint=JBIG-T85)
	(JBIG-stripe-size=128)	(JBIG-stripe-size=128)
	(dpi=204)	(dpi=204)
	(dpi-xyratio=[204/98,204/196])	(dpi-xyratio=[204/98,204/196])

	skipping to change at page 63, line 5 ¶	skipping to change at page 63, line 5 ¶
	(dpi-xyratio=300/300)	(dpi-xyratio=300/300)
	(size-x=[2592/300,3072/300,3648/300]) )	(size-x=[2592/300,3072/300,3648/300]) )
	(& (dpi=400)	(& (dpi=400)
	(dpi-xyratio=400/400)	(dpi-xyratio=400/400)
	(size-x=[3456/400,4096/400,4864/400]) )	(size-x=[3456/400,4096/400,4864/400]) )
	(& (dpi=408)	(& (dpi=408)
	(dpi-xyratio=408/391)	(dpi-xyratio=408/391)
	(size-x=[3456/408,4096/408,4864/408]) ) )	(size-x=[3456/408,4096/408,4864/408]) ) )
	(paper-size=[A4, B4, A3, letter, legal]) )	(paper-size=[A4, B4, A3, letter, legal]) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	(TIFF-C-base) :-	(TIFF-C-base) :-
	(& (image-file-structure=TIFF-C)	(& (image-file-structure=TIFF-C)
	(color=grey)	(color=grey)
	(color-levels<=256)	(color-levels<=256)
	(MRC-mode=0)	(MRC-mode=0)
	(image-coding=JPEG) (image-coding-constraint=JPEG-T4E)	(image-coding=JPEG) (image-coding-constraint=JPEG-T4E)
	(color-space=CIELAB)	(color-space=CIELAB)
	(CIELAB-L-depth<=101)	(CIELAB-L-depth<=101)
	(CIELAB-L-min>=0)	(CIELAB-L-min>=0)

	skipping to change at page 64, line 5 ¶	skipping to change at page 64, line 5 ¶
	(color-levels<=256)	(color-levels<=256)
	(color-space=CIELAB)	(color-space=CIELAB)
	(CIELAB-L-depth=101)	(CIELAB-L-depth=101)
	(CIELAB-L-min>=0)	(CIELAB-L-min>=0)
	(CIELAB-L-max<=100)	(CIELAB-L-max<=100)
	(color-illuminant=D50)	(color-illuminant=D50)
	(dpi=200) (dpi-xyratio=1)	(dpi=200) (dpi-xyratio=1)
	(size-x=864/100)	(size-x=864/100)
	(paper-size=A4) )	(paper-size=A4) )


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	(TIFF-L-full) :-	(TIFF-L-full) :-
	(& (image-file-structure=TIFF-L)	(& (image-file-structure=TIFF-L)
	(MRC-mode=0)	(MRC-mode=0)
	(image-coding=JBIG)	(image-coding=JBIG)
	(image-coding-constraint=JBIG-T43)	(image-coding-constraint=JBIG-T43)
	(JBIG-stripe-size>0)	(JBIG-stripe-size>0)
	(image-interleave=[stripe, plane])	(image-interleave=[stripe, plane])
	(\| (& (color=limited)	(\| (& (color=limited)
	(color-levels<=8)	(color-levels<=8)

	skipping to change at page 65, line 5 ¶	skipping to change at page 65, line 5 ¶
	(& (image-file-structure=TIFF-M)	(& (image-file-structure=TIFF-M)
	(MRC-mode>=1) )	(MRC-mode>=1) )

	Support for multiple TIFF profiles may be indicated by combining	Support for multiple TIFF profiles may be indicated by combining
	their expressions with the OR operator; e.g.	their expressions with the OR operator; e.g.

	(\| (TIFF-F) (TIFF-S) (TIFF-J) )	(\| (TIFF-F) (TIFF-S) (TIFF-J) )

	indicates support for all black-and-white modes.	indicates support for all black-and-white modes.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
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	TIFF-M is a composite mode and must be used in conjunction with	TIFF-M is a composite mode and must be used in conjunction with
	some other mode to define the particular capabilities of a	some other mode to define the particular capabilities of a
	receiver; e.g.	receiver; e.g.

	(\| (TIFF-M-base)	(\| (TIFF-M-base)
	(TIFF-S) (TIFF-J-full) (TIFF-C-base) (TIFF-L-full) )	(TIFF-S) (TIFF-J-full) (TIFF-C-base) (TIFF-L-full) )

	Each sub-image in an MRC image must conform to the capabilities	Each sub-image in an MRC image must conform to the capabilities
	indicated AND also to any additional constraints imposed by the MRC	indicated AND also to any additional constraints imposed by the MRC
	structure, such as bi-level mask layer, etc. See sections A.13 and	structure, such as bi-level mask layer, etc. See sections A.13 and
	section 3.7.	section 3.7.


	Internet Draft Content feature schema for Internet fax	Internet Draft Content Feature Schema for Internet Fax (V2)
	10 August 1999	5 January

	Appendix C: Changes from RFC 2531	Appendix C: Changes from RFC 2531

	00a 23-Jun-1999 Updated Appendix B with more complete TIFF-FX	00a 23-Jun-1999 Updated Appendix B with more complete TIFF-FX
	profile descriptions. Added note to section 3.5	profile descriptions. Added note to section 3.5
	clarifying the meaning of (color=limited) in the	clarifying the meaning of (color=limited) in the
	context of Internet fax. Added note to section	context of Internet fax. Added note to section
	3.6 and A.6 to clarify interpretation of color	3.6 and A.6 to clarify interpretation of color
	depth. In A.6, noted that color gamut is not the	depth. In A.6, noted that color gamut is not the
	same as color resolution; fixed example. Split	same as color resolution; fixed example. Split

	skipping to change at page 67, line 5 ¶	skipping to change at page 66, line 35 ¶
	document [4], and reorganize to make the	document [4], and reorganize to make the
	expression structure less complex. Add details of	expression structure less complex. Add details of
	mailing list for discussion. Added JPEG-only	mailing list for discussion. Added JPEG-only
	colour example. Change definition of image-file-	colour example. Change definition of image-file-
	structure tag to indicate more precisely what is	structure tag to indicate more precisely what is
	being defined, and to draw out the distinction	being defined, and to draw out the distinction
	between a file structure to contain MRC images	between a file structure to contain MRC images
	(image-file-structure), and the MRC image model	(image-file-structure), and the MRC image model
	(MRC-mode).	(MRC-mode).


	Internet Draft Content feature schema for Internet fax	01a 01-Oct-1999 Update author's address and some references.
	10 August 1999
		01b 05-Jan-2000 Incorporate last-call review comments (all
		editorial).

		Internet Draft Content Feature Schema for Internet Fax (V2)
		5 January

	Full copyright statement	Full copyright statement

	Copyright (C) The Internet Society 1999. All Rights Reserved.	Copyright (C) The Internet Society 1999. All Rights Reserved.

	This document and translations of it may be copied and furnished to	This document and translations of it may be copied and furnished to
	others, and derivative works that comment on or otherwise explain	others, and derivative works that comment on or otherwise explain
	it or assist in its implementation may be prepared, copied,	it or assist in its implementation may be prepared, copied,
	published and distributed, in whole or in part, without restriction	published and distributed, in whole or in part, without restriction
	of any kind, provided that the above copyright notice and this	of any kind, provided that the above copyright notice and this

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