OpenCyc

Hi, On page http://sw.opencyc.org/ the downloadable OpenCyc OWL files are dated 2008-06-10 -- but the semantic web endpoint dataset (used on the sw.opencyc.org site) is much more up-to-date, perhaps based upon the OpenCyc 2.0 release of 2009-07-27 Are there plans to release a more up-to-date version of the downloadable OpenCyc OWL files? If so, what time frame are we looking at for this update? The problem with the OpenCyc OWL files currently available (2008-06-10 dump) is that they actually have a lot of errors and inconsistencies in them (specifically both wikipediaArticleUrl and sameAs dbpedia.org mappings are not to be trusted in many cases). These same errors simply are not present in the dataset utilised by the web-based endpoint. A handful of examples:- entity id: Mx4r-pa52L7VQdecB-mbh_CI7Q label: 1,2-dimethylhydrazine bad wikipediaArticleUrl: http://en.wikipedia.org/wiki/12-inch_single bad sameAs: http://dbpedia.org/resource/12-inch_single -- same mistakes not present at http://sw.opencyc.org/concept/Mx4r-pa52L7VQdecB-mbh_CI7Q entity id: Mx4rOOVVsL7GQdeY5f287_-Xgw label: 2,4-tolueneDiisocyanate bad wikipediaArticleUrl: http://en.wikipedia.org/wiki/24_%28TV_series%29 bad sameAs: http://dbpedia.org/resource/24_%28TV_series%29 -- same mistakes not present at http://sw.opencyc.org/concept/Mx4rOOVVsL7GQdeY5f287_-Xgw entity id: Mx4rvjHrCpwpEbGdrcN5Y29ycA label: AH1J (a type of helicopter) bad wikipediaArticleUrl: http://en.wikipedia.org/wiki/Ampere-hour bad sameAs: http://dbpedia.org/resource/Ampere-hour -- ok at http://sw.opencyc.org/concept/Mx4rvjHrCpwpEbGdrcN5Y29ycA entity id: Mx4rGNN6ShPiEdqAAAACs6hfSg label: aboveground thing bad wikipediaArticleUrl: http://en.wikipedia.org/wiki/Mass_Rapid_Transit_%28Singapore%29 bad sameAs: http://dbpedia.org/resource/Mass_Rapid_Transit_%28Singapore%29 -- ok at http://sw.opencyc.org/concept/Mx4rGNN6ShPiEdqAAAACs6hfSg entity id: Mx4rvViadJwpEbGdrcN5Y29ycA label: aggressing (cyc label: AdvancingOnSportsOpponent) bad wikipediaArticleUrl: http://en.wikipedia.org/wiki/Fronted_%28phonetics%29 bad sameAs: http://dbpedia.org/resource/Fronted_%28phonetics%29 -- error not present in live-data at http://sw.opencyc.org/ entity id: Mx4rc-XS8IJLQdeU9IWdf04C6A label: professional counselling bad wikipediaArticleUrl: http://en.wikipedia.org/wiki/Commodity_trading_advisor bad sameAs: http://dbpedia.org/resource/Commodity_trading_advisor entity id: Mx4rvsaaeJwpEbGdrcN5Y29ycA label: generic agent bad wikipediaArticleUrl: http://en.wikipedia.org/wiki/World_Health_Organization This problem extends throughout the whole knowledge-base contained within the currently available OpenCyc OWL downloads. Having such erroneous mappings makes this a far less useful resource than it otherwise would be. I am looking forwards to the release of a more up-to-date / cleaned-up OWL dump. Many thanks, /Jim

After a little more digging about on the OpenCyc website, I see that newer versions of these files are in fact already available! They can be found here: http://opencyc.org/downloads So now this thread isn't about releasing the newer files - instead I'd like to request that the download links are updated at http://sw.opencyc.org/ so as to reflect the release of the newer files. Regards, /Jim

I've just updated the links on http://sw.opencyc.org/ to point to the most recently released OWL files. Thanks for pointing this out! David Baxter

It seems that there is a problem with the server sw.opencyc.org. I've been trying for several days to download the OWL files with no luck. Could you please check that? Thanks!