Registratiion of XML:com.adobe.xmp PNG iTXt chunk keyword

I found the discussion in my own archives, thread 10/08/09 through 11/02/09:
[png-mng-misc] PNG and XMP already a way to consider storing metadata?
plus two messages on 10/09/09 entitled
[png-mng-misc] Proposed "XML:com.adobe.xmp" PNG keyword

http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/
xmp/pdfs/XMP%20SDK%20Release%20cc-2016-08/XMPSpecificationPart3.pdf

paragraph 1.1.5 table 9 PNG data format

length
"iTXt"
keyword "XML:com.adobe.xmp"
NULL (keyword terminator)
0x00 compression flag
0x00 compression method
NULL (language tag terminator)
NULL (translated keyword terminator)
text (UTF-8 encoded XMP packet)
CRC

Only one XMP packet allowed in a PNG.
Can appear anywhere but recommended to be at the beginning.
Adobe recommends using compression flag 0x00 (uncompressed)
and compression method 0x00 (ignored in uncompressed iTXt).

Prior discussion on png-mng-misc, thread beginning 10/08/09 through
11/02/09:
[png-mng-misc] PNG and XMP already a way to consider storing metadata?
plus two messages on 10/09/09 entitled
[png-mng-misc] Proposed "XML:com.adobe.xmp" PNG keyword


Our 2009 discussion ended with Cosmin's proposal:

  It is proposed to register the following new text keyword for
  use in PNG files:

  XML:com.adobe.xmp
  Extensible Metadata Platform (XMP) information, formatted
  as required by the XMP specification [XMP].  The use of iTXt,
  with Compression Flag set to 0, and both Language Tag and
  Translated Keyword set to the null string, are recommended
  for XMP compliance.

  References
  [XMP]
     Adobe Systems Inc., "XMP Specification", September 2005.
     http://www.adobe.com/devnet/xmp/

We didn't vote on it because we were busy with libpng-1.4.0
release, and then never got back to it.

Glenn


On Sat, Jan 14, 2017 at 9:36 PM, Glenn Randers-Pehrson <[email protected]>
wrote:

> There are a couple of messages about that in the SourceForge
> mailing list archives for 2009-10-09 which seem to be continuation of an
> earlier discussion that I cannot find (can't figure out how to search
> the archives by content, only by subject)
>
> Glenn
>
>
> On Sat, Jan 14, 2017 at 9:00 PM, John Bowler <
> [email protected]> wrote:
>
>> But not for XML:com.adobe.xmp I think.
>>
>> Ok.  I'll start a separate thread about the XMP keyword.
>>
>> John Bowler
>>
>>

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