Nancy Hoebelheinrich prompted me to respond to this message (I just
re-joined this list after an 18 month hiatus). If some of the things I say
have been said already on the list during the time it took me to subscribe,
my apologies for any repetition.
Adobe XMP contains a number of built-in namespaces - the most pertinent for
this discussion are probably Dublin Core, what looks like a proprietary
Rights Management Schema (very basic), and an EXIF Schema. You can find
more details on which schemas are built in and what the covered elements
are in the XMP Specification at
http://partners.adobe.com/asn/tech/xmp/download.jsp. XMP metadata could
definitely span a whole range of METS sections, from descriptive to rights
to technical to digital provenance.
However, XMP can potentially do much more than the built in stuff - if you
don't like what's built in, you can define your own namespaces and populate
them with metadata. We have been exploring this as one possible route for
capturing technical metadata according to NISO Z39.87 in RLG's Automatic
Exposure initiative. The community could define what in XMP lingo is called
a "custom panel" with all the NISO Z39.87 elements, which would be
populated through technical metadata XMP harvests out of fileheaders. This
won't give us a complete set of NISO Z39.87 elements, but at least it makes
what's there visible / accessible. We'll have a lot more info on all of
this up soon on the Automatic Exposure website at
http://www.rlg.org/longterm/autotechmetadata.html (which right now is
One of the issues still is how you get the data out of the XMP XML RDF
buckets on a batch basis. Currently, you can save the metadata for
individual files, but there doesn't seem to be a straightforward mechanism
yet to extract metadata out of whole directories of files. We're talking to
an XMP Product Manager about what the options could be.
Hope this helps!
>Bill Lefugy raises a good point about PDF/A and XMP's use of RDF for
>metadata... not having read the XMP specs in any detail, does anyone know
>what sort of metadata XMP will really include? Descriptive I know, and
>rights, but also technical? I'm wondering if XMP metadata would always fit
>nicely in our dmdSec metadata bucket, or it if would actually span several
>of the METS metadata categories.
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