[tdwg-guid] Need for citation information in GUID metadata
Ricardo Scachetti Pereira
ricardo at tdwg.org
Wed Nov 7 02:48:18 CET 2007
Please see my comments in line below.
Bob Morris wrote:
> The problem that nobody will take a position on is this:
> Is the metadata on an image file, or on an image?
I don't want to dismiss this as a simple problem. We've been trying to
knock it down for a long time now. However, I keep wondering why can't
we just include information from both (image and image file) in the
metadata by using different predicates in each case. See an example below.
> Even---or especially if---you stick to DC, you have a problem about
> what things are part of a description. If the metadata is about the
> file, then it is reasonable to express, e.g. that it has 1200x800
> pixels, encoded as jpeg but perhaps not that it is a a picture of a
> flea biting a dog. If the image is being described, the reverse might
Couldn't we say the following about an image?
<dc:title>Picture of my dog Scratchy</dc:title>
<dc:subject>A picture of a flea biting my dog.</dc:subject>
<dc:description>A description of a flea biting my dog. You get
the idea, but an image is worth a thousand words...</dc:description>
Even though I bet the RDF isn't valid, I hope you get the point that
each predicate refers to either the file or the image, but not both.
If some of these predicates aren't suitable, we can always use some
other vocabularies (EXIF?). If you want to refer to what's in the
picture, we can somehow point to our familiar biodiversity information
objects: taxon name, observation, specimen, etc.
Is there a case where this can't be done?
> ... rendering clients probably
> desperately need the pixel size and also information about where to
> find other sizes of the "same" image.
That's a different problem. We had agreed that LSIDs can't be used if
the number of representations of an image is infinite or just very
large. Should we be looking at OpenURL or just Web services (and WSDL)??
But that's a little advanced for our simple discussion thread, isn't it?
So, is this a feasible solution, or is there a class of counter examples
that I'm missing completely?
More information about the tdwg-tag