[mpeg-OTspec] Comment on WD 14496-22

[Levantovsky, Vladimir]

Dear Suzuki-san, all,
 
Thank you very much for your efforts to review the text of OFF
specification and for your valuable comments.
 
I have uploaded a new revision of the text where the following editorial
comments have been resolved and addressed:
 
1) References to ISO/IEC 10646
I agree with you that none of the amendments to this standard should be
excluded (even if the exclusion is only implied). According to JTC1
Directives, chapter 6.3, I modified the text removing all dated
references to this standard. The undated references are now in effect,
which according to JTC Guidelines and, as mentioned in clause 2
"Normative references" assume that "the latest edition of the referenced
document (including any amendments) applies".
 
2) OpenType feature tag registry - I added the missing description of
the 'hojo' and 'jjp04' tags.
 
3) I have fixed the historical references to features and functionality
introduced in the earlier versions of OpenType specifications, where
applicable.
 
As far as the level of support of Unicode Variation Sequences is
concerned, I believe it would warrant more discussions before any
changes are introduced, and this is exactly one of the mandates of this
AHG. I'd welcome the additional input from you and other group members
on this subject.
 
Thank you and regards,
Vladimir
 


________________________________

	From: mpeg-OTspec at yahoogroups.com
[mailto:mpeg-OTspec at yahoogroups.com] On Behalf Of
mpsuzuki at hiroshima-u.ac.jp
	Sent: Tuesday, February 19, 2008 3:36 AM
	To: mpeg-OTspec at yahoogroups.com
	Cc: Levantovsky, Vladimir
	Subject: [mpeg-OTspec] Comment on WD 14496-22
	
	

	Dear Sirs,
	
	I appreciate your efforts to update ISO/IEC 14496-22
	for synchronization to OpenType 1.5. One of the interesting
	feature of OpenType 1.5 for CJKV people is the explicit
	support of Unicode Variation Sequences.
	
	Yet I've not checked in full, but now I have 3 questions
	on ISO/IEC 14496-22 2nd ed. WD.
	
	ISO/IEC 10646 and Unicode references
	------------------------------------
	
	After ISO/IEC 10646:2003, there are 2 amendments,
	Amd.1:2005 and Amd.2:2006. Unicode 5.0 claims it
	supports these 2 amendments, so, I think there's no 
	reason to exclude these amendments from the normative
	list, except an editorial reason to avoid "too many
	references".
	
	Speaking as a person from Japan, Amd.1:2005 includes
	the update for Japanese industrial standard of
	character set JIS X 0213:2004, so I wish if ISO/IEC
	10646 amendments are explicitly cited.
	
	One of the remarkable feature of OpenType 1.5 is
	variation sequence support by cmap format 14.
	Unicode variation sequence is a part of Unicode,
	but there is more "normalized" operation of UVS,
	Ideographic Variation Database (IVD)
	http://www.unicode.org/ivd/index.html
<http://www.unicode.org/ivd/index.html> 
	IVD is standardized by Unicode Technical Standard #37,
	http://www.unicode.org/reports/tr37/
<http://www.unicode.org/reports/tr37/> 
	but this is NOT a part of Unicode standard. So, I'm
	interested in if ISO/IEC 14496-22 will list it in
	Normative Reference, or not, or leave it to OpenType
	specification maintainers.
	
	version number
	--------------
	In the case of Open Font Format, there is an idea of version
	number (except of the publishing date of ISO/IEC 14496-22)?
	If there is, ISO/IEC 14496-22:2007 is 1.0? Or, to synchronize
	with OpenType v1.4, it should be 1.4? There might be 2 different
	ways of correction, I think.
	
	correction a)
	remove the sentence. Because OpenType 1.3 was never standardized
	as a part of ISO, so it's reasonable to claim that there's no
	previous version of OFF before ISO/IEC 14496-22:2007.
	
	correction b)
	replace it as "OpenType 1.3" as original OpenType 1.4 spec said.
	
	OpenType layout feature registry
	--------------------------------
	
	On 14496-22 2nd WD p. 296-300 "5.4.3.1 Feature Tag List",
	there are 2 undescribed tags.
	
	In OpenType 1.4 & 1.5, "jp04" and "hojo" tags are listed
	and described. In ISO/IEC 14496-22:2007, they are not
	listed and not described. In 14496-22 2nd ed WD, they
	are listed but not described. Personally, I wish if they
	are listed and described, but if there's background
	reason to drop them in ISO/IEC 14496-22:2007 (and it's not
	outdated), they should be dropped in the 2nd edition either.
	
	Regards,
	mpsuzuki
	

	 

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