2009/7/13 Georgi Kobilarov <[email protected]>: > Hi John, > > it is true that the pagelinks dataset has not been loaded into the > dbpedia.org/sparql instance. We did load it once, but most Linked Data > and Sparql clients struggled with the very large result sets. For > example, DESCRIBE http://dbpedia.org/resource/United_States would result > in more than 300k triples due to the pagelinks (in particular because of > inbound links) > > So we decided to only provide that dataset for download, but don't load > it. I think it would be possible to provide a different rdf instance > containing the pagelinks as well, but for the moment you'd have to load > that dataset into your own repository.
In any very highly linked dataset you will find that DESCRIBE behaviour implemented to retrieve both subject and object triples will pretty much fail because of this issue. It is a shame that the inter article links in Wikipedia are so diverse that they aren't accessible using Linked Data anymore... ;-) (Seriously though, it is actually a shame that there is a barrier to accessing this information without downloading the dataset yourself, and even then you have to explain to others that they need to do it themselves also...) If only there was a way to tell the DESCRIBE query to get subject triples and any referenced blank nodes but ignore triples which would only be included because the URI was the object, but sadly DESCRIBE queries are specified to be vendor implemented so anything could happen in the future with ones DESCRIBE query I guess? Do the triples where the URI is the subject get retrieved before the more trivial triples where the URI is the object? Depending on the limits that are set you might also be unable to actually retrieve all of the triples in cases like this even if you did set up another endpoint just for pagelinks. The public dbpedia endpoint is setup from memory so a client can't even use LIMIT and OFFSET to get 300 thousand triples? Cheers, Peter ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Dbpedia-discussion mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
