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https://issues.apache.org/jira/browse/TIKA-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198047#comment-13198047
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Nick Burch commented on TIKA-842:
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One thing to bear in mind is that we try to map the metadata from different
file formats onto the same common metadata keys/properties, so that it's easy
for people to use Tika in a common way. (We try to avoid them having to know
about the file format differences if possible)
I'm slightly hesitant to go for something called DC_SUBJECT, as if possible we
want to avoid the issue of some file formats producing one kind of subject, and
others a different one, when they both refer to the same sort of thing
However, in this case, we are slightly constrained by the SUBJECT key already
existing in the old form. Additionally, the aliasing from IPTC to the common
one does seem to me an OK way to deal with bringing different formats to using
the same metadata keys, so that could be fine.
It's just a shame that there's not an easy way to turn the existing SUBJECT key
into a typed property without breaking things... So maybe this is our best bet
> IPTC Properties Should be Defined Completely and Independently of the Drew
> Library
> ----------------------------------------------------------------------------------
>
> Key: TIKA-842
> URL: https://issues.apache.org/jira/browse/TIKA-842
> Project: Tika
> Issue Type: Improvement
> Components: metadata
> Affects Versions: 1.0
> Reporter: Ray Gauss II
> Fix For: 1.1
>
> Attachments: IPTC-metadata-def-patch.diff
>
>
> All of the IPTC XMP specification should be defined in tika-core and should
> not be reliant on the Drew Noakes library as it is incomplete in its support
> of the standard and the properties are not defined in proper namespaces or
> prefixed.
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