- From: joel sachs <jsachs@csee.umbc.edu>
- Date: Wed, 8 Sep 2010 10:42:45 -0400 (EDT)
- To: public-lod@w3.org, freebase-discuss@freebase.com, taxacom@mailman.nhm.ku.edu
I'd like to catalog sources of biodiversity information and misinformation on the semantic web, and am trying to determine the genesis of some unfortunate owl:sameAs statements. According to sameas.org: <http://dbpedia.org/resource/Invasive_species> <owl:sameAs> <http://dbpedia.org/resource/Invasive_plant> <http://dbpedia.org/resource/Invasive_animal> <http://dbpedia.org/resource/Invasive_organism> <http://rdf.freebase.com/ns/guid.9202a8c04000641f800000000007de24> (many other concepts) Checking out the dbpedia resources that are the objects of the sameAs assertions, we see that each redirects to http://dbpedia.org/resource/Invasive_species. But other than dbpedia:Invasive_species including a sameAs link to freebase:Invasive_species, no dbpedia page, afaict, makes the sameAs assertions listed above. However, http://rdf.freebase.com/rdf/guid.9202a8c04000641f800000000007de24 does assert: <http://rdf.freebase.com/ns/guid.9202a8c04000641f800000000007de24> <owl:sameAs> <http://dbpedia.org/resource/Invasive_species> <http://dbpedia.org/resource/Invasive_plant> <http://dbpedia.org/resource/Invasive_organism> <http://dbpedia.org/resource/Invasive_animal> etc. The direction of propagation is not explicit. One possibility is that sameas.org is inferring that "A sameAs B" based on "A redirects to B", and that these assertions are making their way into freebase. Another is that a freebase contributor is making the sameas inferences, and that they are being picked up by sameas.org. (Similar cycles of sameAs can be found for "habitat", "introduced_species", and many other concepts.) So, a request for the sameas.org folks: Would it be possible to include a provenance column for all sameAs assertions you keep track of? In cases where the sameAs assertion isn't actually asserted on the web, you could indicate the provenance as "inferred" in the provenance column. Also, have you published the heuristics you use (if any) to infer sameAs relations? And questions for freebase contributors: Are any of you running a script that either a) loads in assertions from sameas.org, or b) deduces sameAs relations from dbepedia redirection behaviour? Thanks! Joel.
Received on Wednesday, 8 September 2010 14:43:49 UTC