Hello,
Does anyone know why the Prism namespace version for the latest version of Exiftool is older than the namespace included in version 9 of Exiftool?
The following line is present in the XMP.pm file in the latest version of Exiftool:
prism => 'http://prismstandard.org/namespaces/basic/2.0/'
Whereas, the same entry in version 9 shows:
prism => 'http://prismstandard.org/namespaces/basic/2.1/'
The reason for asking is that I'm trying to write a Publication date attribute to an image metadata for an export. Previously in version 9, I would write the element using:
exiftool -m -overwrite_original -XMP-prism:publicationDate=2025-01-06T00:00:00Z /tmp/tmp180009167599789746.psd
This would result in the following being written to the image file:
<prism:publicationDate>2025-01-06T00:00:00Z</prism:publicationDate>
In order to write the Publication date under the latest version of Exiftool, I now need to perform the following to create a structure:
exiftool -XMP-prism:publicationdate="{date=2008-02-15T00:00:00Z}" /tmp/tmp/38093755.psd
Which results in:
<prism:publicationDate>
<rdf:Bag>
<rdf:li rdf:parseType='Resource'>
<prism:date>2008-02-15T00:00:00Z</prism:date>
</rdf:li>
</rdf:Bag>
The Prism documentation for the latest namespace is a bit vague on whether a structure is needed for the publication date attribute, but the exiftool seems to require it in order to add the attribute.
https://www.w3.org/submissions/2020/SUBM-prism-20200910/prism-basic.html#_Toc46322864
Any insights would be appreciated.
Thanks,
Lindsay
Hi Lindsay,
There is an error in the namespace URI, it should be 3.0 not 2.0. I'll fix that. Thanks.Edit: Actually, it probably isn't a good idea to change this. Namespace URI's shouldn't be used to store version numbers because it breaks backward compatibility. I may have done this on purpose to avoid breaking things for people who were already using 2.0. This isn't a justification, but note that a number of examples in the PRISM 3.0 documentation still use the 2.0 namespace URI.Regarding PublicationDate, the 3.0 specification says this:
Quote4.2.59 prism:publicationDate
Profile #3 (XMP)
bag prismPublicationDate structure
publicationDate.date Date
publicationDate.a-platform Text, closed choice prismPlatform controlled
vocabulary
- Phil