Web Ontology (RDF possiblites)
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Hey,
It looks like you have some pretty neat little modeling projects going on. I especially like the social domain you have, because it ties into why I'm writing this post in the first place. :)
Obviously, you seem to have an interest in RDF, so I would highly recommend that you take a look at Jamie Taylor's web_ontology type (http://www.freebase.com/view/user/jamie/web_ontology/ontology). There will probably be some schema changes soon (including a type with the freebase equivalence) and hopefully the schema will be made to reflect RDFS more closely. Basically the idea is to model the relationship between an RDF schema and (a) freebase schema(s). This combined with some tooling, will make it possible to both import and export RDF, and since RDFS is RDF itself, make it possible to easily add new schemas (with someone coming in and filling in the freebase equivalence entries for it).
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Ah, the foaf ontology looks especially interesting.
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Which is why I started by mentioning your Social domain ;)
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http://clockwerx.blogspot.com/2008/06/how-to-extract-useful-owl-from-freebase.html is kinda relevant to this discussion
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I've been playing with some RDF mapping in my own domain as well. It's similar to jamie's but with a few extra features.
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Shawn - this is really cool. You really took this to the next level. I especially like the ontology_attribute_mapping taking not only a property but a type (indicating when the property mapping applies. Alexb suggested this to me a while back - but I never got around to adding it!)
I'm not sure that I fully appreciate the ontology_class_mapping connecting with general Freebase Topics. Do you have a specific use in mind for that relationship?
One thing I had toyed with (on sandbox a few months ago) was adding the ability to map not just Freebase to other ontologies, but allowing multiple ontologies to be mapped together. I think it begs for ontology properties to be represented as objects themselves that can be linked together.
Have you written any code against this?
I'd love to collaborate on this if you are interested and see if we can get a larger community involved (and using it!)
Jamie
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Thanks Jamie, I really got inspired by the domain you created.
The reasons why I linked equivalent classes to topics are two-fold. First, I wasn't able to create reverse properties from a Type as easily as I could to my own Ontology Class type. More importantly though, I wanted to link multiple ontologies together as well as with Freebase.
By linking classes to topics, it means that you can search for a topic like Country and get a list of equivalent ontology classes from many different ontologies. My intention was that these topics would then by typed as Type/Domain Equivalent topics as many of them already are. You can also leverage the Also Known As property of those topics to help map ontologies together. As you mentioned, it would probably be a good idea to do something similar for properties.
Ideally I would like to map Freebase to UMBEL because they have mappings to Cyc, Dbpedia and other ontologies. I am starting to write some code to help map the 1,300 or so top level Freebase Types onto the 20,000 UMBEL concepts but that will take some time.
I'd be happy to do what I can to get more people using Freebase as a common ground for ontology mapping.
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hey, you guys are smart, and should be working together.
which one should i import to?
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I haven't really done much work on my base in a while but if there's enough interest in collaborating on some of this ontology metamodeling then I'd be happy to look at combining our efforts. In the mean time, I guess just use whichever schema you find easier and the data can be migrated over to another format later if need be.
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Spencer, Shawn -
I continue to work on various "services" that use pieces of my ontology domain (things like the prototype: http://rdfvocab.freebaseapps.com/ that I plan to incorp into the RDF service endpoint.)
I have some small changes to make to the vocabulary schema to aid (and simplify) the mapping semantics.
Spencer, I'd be excited to have more data to work with - and it would help me refocus on the mapping applications if you are interested in contributing data.
J
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