- From: Hausenblas, Michael <michael.hausenblas@joanneum.at>
- Date: Fri, 8 Aug 2008 20:34:31 +0200
- To: "Tim Berners-Lee" <timbl@w3.org>, "KANZAKI Masahide" <mkanzaki@gmail.com>
- Cc: "SW-forum Web" <semantic-web@w3.org>, "Ivan Herman" <ivan@w3.org>, "Norman Walsh" <ndw@nwalsh.com>
- Message-ID: <768DACDC356ED04EA1F1130F97D29852014C62B6@RZJC2EX.jr1.local>
Tim, Kanzaki, > Should a group be standardizing the exif ontology, do people think? Yes. How about [1]? We had a good start last year [2] - why not using the momentum for something valuable such as Exif. Cheers, Michael [1] http://www.w3.org/2008/01/media-annotations-wg.html <http://www.w3.org/2008/01/media-annotations-wg.html> [2] http://www.w3.org/2005/Incubator/mmsem/XGR-vocabularies/ <http://www.w3.org/2005/Incubator/mmsem/XGR-vocabularies/> ---------------------------------------------------------- Michael Hausenblas, MSc. Institute of Information Systems & Information Management JOANNEUM RESEARCH Forschungsgesellschaft mbH Steyrergasse 17, A-8010 Graz, AUSTRIA <office> phone: +43-316-876-1193 (fax:-1191) e-mail: michael.hausenblas@joanneum.at web: http://www.joanneum.at/iis/ <https://webmail.joanneum.at/exchweb/bin/redir.asp?URL=http://www.joanneum.at/iis/> <private> mobile: +43-660-7621761 web: http://sw-app.org/ <http://sw-app.org/> http://webofdata.info <http://webofdata.info> ---------------------------------------------------------- ________________________________ From: semantic-web-request@w3.org on behalf of Tim Berners-Lee Sent: Fri 2008年08月08日 20:07 To: KANZAKI Masahide Cc: SW-forum Web; Ivan Herman; Norman Walsh Subject: Re: New Exif/RDF vocabulary Kanzaki, I have only now looked at it. The tools look nice. I have one comment about the modeling. Looking at for example http://www.kanzaki.com/test/exif2rdf?u=http://web.canon.jp/Imaging/ixy30/SPL/IMG_0138.JPG <http://www.kanzaki.com/test/exif2rdf?u=http://web.canon.jp/Imaging/ixy30/SPL/IMG_0138.JPG> there is what seems to be an extra arc "exifdata" to a bnode labelled "Exif Image File Data", and then the exposureTime is a property of the exifdata, not of the original phototo. The arc seems to be used to group the data in the file, but I would find it more useful I think to define the exposureTime as a property of the picture itself. I like the modeling of the various enumeration types I think make sense, such as YCbCr vs sRGB etc. I would be more inclined to model units using predicates. Instead of (in N3) exif:focalPlaneResolutionUnit exif:inches; exif:focalPlaneXResolution "9846.15384615"; exif:focalPlaneYResolution "9846.15384615"; I would be inclined to use exif:focalPlaneXResolution [ exif:inches "9846.15384615" ]; exif:focalPlaneYResolution [ exif:inches "9846.15384615"]; You can the for example deduce what the exif:focalPlaneYResolution of something is in meters without any contradictions. exif:focalPlaneXResolution [ exif:inches "9846.15384615" ; unit:m "250.0"]; exif:focalPlaneYResolution [ exif:inches "9846.15384615"; unit:m "250.0"]; (Hmm .. in this example it looks as though the meters was probably the original figure!) or even exif:focalPlaneXResolution [ exif:inches 9846.15384615 ; unit:m 250.0]; exif:focalPlaneYResolution [ exif:inches 9846.15384615 ; unit:m 250.0]; I made a simple suitable units ontology by the way at http://www.w3.org/2007/ont/unit <http://www.w3.org/2007/ont/unit> Should a group be standardizing the exif ontology, do people think? How stable is the http://www.kanzaki.com/ns/exif <http://www.kanzaki.com/ns/exif> namespace? Would you like a w3.org namespace for it? Keep up the good work! Tim ______________________________ excerpt from the exit example mentioned above: <foaf:Image rdf:about="http://web.canon.jp/Imaging/ixy30/SPL/IMG_0138.JPG <http://web.canon.jp/Imaging/ixy30/SPL/IMG_0138.JPG> "> <dc:date>2003年01月18日T16:07:30</dc:date> <!-- Metadata from Exif section --> <make>Canon</make> <model>Canon IXY DIGITAL 30</model> <orientation rdf:resource="http://www.kanzaki.com/ns/exif#right- <http://www.kanzaki.com/ns/exif#right-> top"/> <xResolution rdf:datatype="&xsd;decimal">180</xResolution> <yResolution rdf:datatype="&xsd;decimal">180</yResolution> <resolutionUnit rdf:resource="http://www.kanzaki.com/ns/ <http://www.kanzaki.com/ns/> exif#inches"/> <dateTime>2003年01月18日T16:07:30</dateTime> <yCbCrPositioning rdf:resource="http://www.kanzaki.com/ns/exif#centered <http://www.kanzaki.com/ns/exif#centered> "/> <exif-info> <Exif_IFD rdfs:label='Exif Image File Data'> <exposureTime rdf:datatype="&xsd;decimal">0.0025</exposureTime> <fNumber rdf:datatype="&xsd;decimal">3.5</fNumber> <exifVersion>0220</exifVersion> [1] http://www.w3.org/2001/sw/BestPractices/MM/interop.html <http://www.w3.org/2001/sw/BestPractices/MM/interop.html> On 2007-12 -13, at 11:50, KANZAKI Masahide wrote: > > 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. > > thanks, > > [1] http://www.kanzaki.com/ns/exif <http://www.kanzaki.com/ns/exif> > [2] http://www.w3.org/2003/12/exif/ns <http://www.w3.org/2003/12/exif/ns> > [3] http://www.kanzaki.com/ns/exif-tags.json <http://www.kanzaki.com/ns/exif-tags.json> > [4] http://www.kanzaki.com/test/exif2rdf <http://www.kanzaki.com/test/exif2rdf> > > > -- > @prefix : <http://www.kanzaki.com/ns/sig# <http://www.kanzaki.com/ns/sig#> > . <> :from [:name > "KANZAKI Masahide", "????"; :email "mkanzaki@gmail.com"]. >
Received on Friday, 8 August 2008 18:35:15 UTC