Dear Martynas, I understand your concern. Markus already commented on the Quads and the fact that there are no where used in the way you suggest it. I am thankful for critically accompanying our design phase, but I would again ask you for some patience until we have the RDF mapping drafted.
We are very well aware of the advantages and importance of using Semantic Web standards. And I know well what a Semantic Web application is. Heck, check my CV. I've been two times finalist for the Semantic Web Challenge. And I know many people involved in the provenance working group, as well as those who have been working on standards like RDF and OWL. So even though this doesn't mean much -- people should be judged by their actions, not by their pedigree or social network -- I at least hope that you will be able to wait until we drafted our RDF mapping document. I would hope that, as soon as we do that, you will again critically review our work. Cheers, Denny 2012/4/6 Martynas Jusevicius <[email protected]> > Hey Denny, > > I gave it a shot: > > <http://dbpedia.org/resource/France> > <http://dbpedia.org/ontology/PopulatedPlace/populationDensity> > "116"^^<http://dbpedia.org/datatype/inhabitantsPerSquareKilometre> > <http://wikidata.org/graphs/France2012> . > <http://dbpedia.org/resource/France> > <http://dbpedia.org/ontology/populationDensity> > "116"^^<http://www.w3.org/2001/XMLSchema#double> > <http://wikidata.org/graphs/France2012> . > > <http://wikidata.org/graphs/France2012> > <http://purl.org/dc/terms/date> > "2012"^^<http://www.w3.org/2001/XMLSchema#year> > <http://wikidata.org/graphs/France2012> . > <http://wikidata.org/graphs/France2012> > <http://purl.org/dc/terms/source> _:source > <http://wikidata.org/graphs/France2012> . > _:source <http://purl.org/dc/terms/published> > "2010"^^<http://www.w3.org/2001/XMLSchema#year> > <http://wikidata.org/graphs/France2012> . > _:source <http://purl.org/dc/terms/title> "Bilan demographique"@fr > <http://wikidata.org/graphs/France2012> . > > The syntax is N-Quads. It does not use reification, but instead named > graphs for provenance. The necessary concepts were already present in > DBPedia. > > As you might know, temporal provenance is not the strongest point of > RDF. However conventions and solutions are available, and I am sure > implementing them would require far less effort than creating a custom > data model from scratch, not to mention the benefits of potential > reuse. > There's quite some research done on RDF provenance, which is worth > looking into if provenance is really a key feature for Wikidata from > day one. I see it as something that should work transparently behind > the scenes, and therefore could be rolled-out later on. > > You would get much better and more extensive advice than mine on > [email protected] -- the only prerequisite is willingness to > cooperate. > > RDF's strength is that it solves data integration problems by pivotal > conversion, reducing the number of model transformations from > quadratic to linear: > http://en.wikipedia.org/wiki/Data_conversion#Pivotal_conversion > A custom data model brings up questions which already have an answer > in the Semantic Web stack: > # can data from different Wikidata instances be merged or interlinked > natively? > # is there a native query language? In case of SQL, how performant > will it be given many JOINs and the planned use of provenance? > # what and how many custom serialization formats and API mechanisms > will have to follow? > > Stacking one custom solution on top of another can eventually result > in huge costs. I honestly think the energy of Wikidata could be > directed in a more productive way. > > > Martynas > graphity.org > > > 2012/4/5 Denny Vrandečić <[email protected]>: > > Dear Martynas, > > > > if you try to model the following statement in RDF > > > > "The population density of France, as of an 2012 estimate, is 116 per > square > > kilometer, according to the "Bilan demographique 2010"." > > > > you might notice that RDF requires a reification of the statement. The > data > > model that you have seen provides us with an abstract and concise way to > > talk about these reifications (i.e. via the statement model, just as in > > RDF). > > > > We still have not finished the document describing how to map our data > model > > to OWL/RDF, but we have thought about this the whole time while > discussing > > the data model. > > > > But if you find a simpler, and more RDFish way to express the above > > statement, please feel free to enlighten me. I would be indeed very > > interested. > > > > Cheers, > > Denny > > > > > > > > 2012/4/5 Martynas Jusevicius <[email protected]> > >> > >> it doesn't look like reuse of existing concepts and standards is a > >> priority for this project. > >> One cannot build a Semantic Web application by ignoring its main > >> building block, which is the RDF data model. > > > > > > -- > > Project director Wikidata > > Wikimedia Deutschland e.V. | Eisenacher Straße 2 | 10777 Berlin > > Tel. +49-30-219 158 26-0 | http://wikimedia.de > > > > Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e.V. > > Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg > unter > > der Nummer 23855 B. Als gemeinnützig anerkannt durch das Finanzamt für > > Körperschaften I Berlin, Steuernummer 27/681/51985. > > > > > > _______________________________________________ > > Wikidata-l mailing list > > [email protected] > > https://lists.wikimedia.org/mailman/listinfo/wikidata-l > > > > _______________________________________________ > Wikidata-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikidata-l > -- Project director Wikidata Wikimedia Deutschland e.V. | Eisenacher Straße 2 | 10777 Berlin Tel. +49-30-219 158 26-0 | http://wikimedia.de Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e.V. Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg unter der Nummer 23855 B. Als gemeinnützig anerkannt durch das Finanzamt für Körperschaften I Berlin, Steuernummer 27/681/51985.
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