[Clipart] Metadata Proposal (WAS) developing an xml schema standard for packaged multimedia

Wed Apr 6 11:58:40 PDT 2005

Sorry about the reply to myself here, but upon further investigation,
I think I see the issue.

It looks like <dc:subject/> is being used to store the category, and
the open clip art project doesn't really have a concept of keywords
yet.

For example, if an you had the following categories:
- Animals->Dogs
- People->Men

and you had an image with a dog and a man in it, how would this be
represented?

I think <dc:type/> should be used to store the categories in a more
formal way. This could be done, for example, as such:
<dc:type>
  <rdf:Bag>
    <rdf:li>Animals.Dogs</rdf:li>
    <rdf:li>People.Men</rdf:li>
  </rdf:Bag>
</dc:type>

And then <dc:subject/> could be used for keywords that are outside of
the scope of categories.

Thoughts?

mike

--- Mike Traum <mtraum at yahoo.com> wrote:

> I guess this discussion has already been had:
> http://www.openclipart.org/cgi-bin/wiki.pl?MetadataDiscussion
> 
> I took a look at the RDF/XML + Dublin Core + Creative Commons
> Metadata proposed here (and that's being added to the svg's).
> There's
> no category field. If that's just tossed in with the 'subject',
> then
> it's not really a category, but a keyword. How is a parser to know
> what the category is? It looks like these aren't even keywords
> anyway, but actually used to generate a file path.
> 
> Also, the proposal says nothing about bitmaps. I like Nathan's idea
> of distributing an rdf per file in the package (zip/tarball).
> 
> If a metadata is approved and set, and openclipart packages are
> distributed using this metadata, I will commit to writing a
> cross-platform media organizer that will allow client side
> searches,
> etc.
> 
> mike
> 
> --- Mike Traum <mtraum at yahoo.com> wrote:
> 
> > I tend to agree with what you are saying regading the files not
> > being
> > in the xml itself.
> > 
> > But, a schema still needs to be created for the metadata. What
> > group
> > would be the best for approching this idea with? This goes beyond
> > the
> > scope of just clipart, although I think it does belong in the
> realm
> > of freedesktop.org.
> > 
> > I would highly disagree with the idea of bundling thumbnails (or
> at
> > least make it optional). I think that should be the job of
> > applications. There are plenty of thumbnailer apps. Besides, you
> > already get this for wmv, jpeg, etc with Windows Explorer and
> Gnome
> > Nautilus (wmf with the right plugin).
> > 
> > mike
> > 
> > 
> > --- Nathan Eady <eady at galion.lib.oh.us> wrote:
> > 
> > > Mike Traum wrote:
> > > > I think an xml schema should be developed for a bundle of
> > > multimedia
> > > > files. There may be one already, but in my brief search I was
> > not
> > > > able to come up with anything.
> > > 
> > > Maybe I'm just old-fashioned, but I would think that an archive
> > > format,
> > > such as PKWare ZIP format, would make more sense than XML for a
> > > bundle
> > > of files.  Even OpenOffice, which uses XML extensively, uses
> ZIP
> > > for
> > > packaging up groups of related files together.  Seems to work
> > very
> > > well.  Java and Mozilla also use the ZIP format for similar
> > > purposes
> > > (jar and xpi, respectively).
> > > 
> > > > This would allow metadata such as keywords and categories to
> be
> > > > distributed with multimedia, allowing easier use on the
> client
> > > side.
> > > 
> > > Metadata, such as keywords, can be embedded into the files (if
> > they
> > > are in an XML-based format, such as SVG) using RDF.  For files
> > that
> > > are not in an XML-based format, such as WMF, we have for lack
> of
> > > a better solution been placing foo.rdf right alongside of
> foo.wmf
> > > or whatever.
> > > 
> > > > For example, you could then download a bunch of clipart from
> > > > openclipart.org as an xml file. This xml file could then be
> > used
> > > in a
> > > > multimedia organizer application which would give you the
> > ability
> > > to
> > > > search keywords and see the categories.
> > > 
> > > The multimedia organizer application would need to have
> knowledge
> > > of the format in question.  If we accept that limitation,
> though,
> > > ZIP works just as well:
> > > 
> > > For example, you could then download a bunch of clipart from
> > > openclipart.org as a zip file.  This zip file could then be
> used
> > in
> > > a
> > > multimedia organizer application which would give you the
> ability
> > > to
> > > search keywords and see the categories.
> > > 
> > > I don't see how using XML for the container format adds
> anything.
> > > 
> > > > I realize that svg has the ability to have embedded metadata,
> > but
> > > > many other format's do not.
> > > 
> > > If you don't like placing the metadata alongside in an rdf file
> > > within the package, another option would be to put the metadata
> > in
> > > a manifest file, which could be included in the package.  The
> > file
> > > format for the manifest file could be XML, but ZIP could still
> be
> > > used for the container format.
> > > 
> > > There's a significant advantage to using ZIP for the container:
> > > users who don't have the multimedia organizer application
> > installed
> > > (e.g., because they haven't bothered to install it, or because
> it
> > > does not yet exist currently) can use standard tools (info-zip,
> > > pkunzip, Nautilus, Winzip, recent versions of Windows Explorer,
> > > or whatever) to get at the clipart.  With an XML-based
> container
> > > format, that becomes impossible, and the archive is useless to
> > > anyone who doesn't have the special application.
> > > 
> > > I would think we should use XML for the metadata, but use
> > > ZIP or something like it for bundling up the files together.
> > > 
> > > It should also be noted that we really need to package up
> > > thumbnails, in addition to text-like metadata such as author
> > > and title and keywords, with each file.
> > > _______________________________________________
> > > clipart mailing list
> > > clipart at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/clipart
> > > 
> > 
> > 
> > 
> > 		
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> 
> 
> 
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