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New Exif/RDF vocabulary

From: KANZAKI Masahide <mkanzaki@gmail.com>
Date: Fri, 14 Dec 2007 01:50:10 +0900
Message-ID: <834575810712130850t7a97e90fgd07f2444a811b095@mail.gmail.com>
To: semantic-web@w3.org

Hello all,

Several years after my release of Exif RDF vocabulary [1], I updated
the schema with some significant changes.

The old vocabulary was defined as RDF schema and no rdfs:domain and
rdfs:range were provided for property descriptions. While many of Exif
tag values come just as numbers, how to describe those values in RDF
was not cleary defined.

This time, I redefined the vocabulary as OWL ontology, so that tags
whose values have pre-defined interpretation are defined as
owl:ObjectProperty, and their possible values as resources denoted by
URIs. Also, domain of properties are defined (via super properties) so
as Exif's IFD structure to be retained in the RDF data.

Although those changes made the new definition incompatible with the
old one, I would keep its namespace URI [1 + '#'] intact. If you need
old definition vocabulary (which might be easier to use in
hand-writing), its copy is available at W3C with somewhat authentic
URI [2]. I will finalize this change within a week unless any
objection (e.g. assign different URI for new definition).

For users convenience, the new definition comes with a JSON file [3]
which provides mapping from Exif tags/values to RDF
properties/value-resources. A sample Web application to extract RDF
from image file [4] now uses the new definition.

Comments, suggestions are welcome, of course.


[1] http://www.kanzaki.com/ns/exif
[2] http://www.w3.org/2003/12/exif/ns
[3] http://www.kanzaki.com/ns/exif-tags.json
[4] http://www.kanzaki.com/test/exif2rdf

@prefix : <http://www.kanzaki.com/ns/sig#> . <> :from [:name
"KANZAKI Masahide", "神崎正英"; :email "mkanzaki@gmail.com"].
Received on Thursday, 13 December 2007 18:12:56 UTC

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