- From: Richard Cyganiak <richard@cyganiak.de>
- Date: Wed, 7 Nov 2007 21:46:10 +0000
- To: Hugh Glaser <hg@ecs.soton.ac.uk>
- Cc: "Linking Open Data" <linking-open-data@simile.mit.edu>, "SW-forum Web" <semantic-web@w3.org>, "Ian Millard" <icm@ecs.soton.ac.uk>
Hugh, This looks like it could be an awesome resource. Unfortunately I didn't have much luck getting any kind of data back from the services. The "browse" function doesn't do anything useful for me. I searched for a wide variety of terms, including "the", "a" and "2003" in the first ten or so datasets, including the one called Citeseer and DBLP. No results. What am I supposed to put into the search box? I also tried to explore the datasets using SPARQL queries. I started with queries such as SELECT DISTINCT ?class WHERE { ?x a ?class } to learn about the vocabulary used in the dataset. These queries return some results on some of the datasets (they time out on others), but clicking any of the results consistently showed a page with zero results. Same for opening in an RDF browser. So in fact, despite honestly trying, the only way I could get any real data back from the services was by using the four example URIs provided at www.rkbexplorer.com . Obviously a lot of work went into this. It's a shame that it's so hard to make any use of it because the last 5% are missing. What are those last 5%? 1. A brief description of what each dataset actually is, and what sort of data it contains. The currently available information (who provided the data and some triple counts) are not enough. 2. A bunch of representative example URIs for each dataset. 3. A bunch of representative and interesting SPARQL queries against each dataset. 4. If possible, a note on what vocabulary (classes and properties) are used in each dataset. This would greatly simplify SPARQLing the datasets. 5. You should think really hard about “natural” navigation entry points into the datasets. Is there any natural “root” from which everything can be accessed? Is there a category system or class hierarchy that one can navigate along to find interesting stuff? 6. You should consider adding a few domain-specific search functions, such as the simple “Find Yourself” function provided at http://dblp.l3s.de/d2r/ . I'm a bit frustrated because this looks like an amazingly great resource, but I can't actually get any clear feeling for its scope or quality or contents. This feels like exploring a pitch black room while wearing boxing gloves. I'm very hopeful that you can greatly improve this experience with little effort. Thanks a lot, Richard On 6 Nov 2007, at 16:00, Hugh Glaser wrote: > > Hi, > > We have constructed some rdf resources and an application that uses > them, > that can be found at: > http://www.rkbexplorer.com/ > > Each resource has a different domain, to make it easy to use, and > emphasising the fact that these are in fact completely separate > knowledge > bases. > > For each resource, you can access it in the following ways: > > Browse it, looking at the RDF triples; > Query it, using SPARQL; > Resolve each of the unique URIs for resources: depending on content > negotiation, RDF or HTML will be returned; > Query the associated CRS (Consistent Reference Service), to find out > which > other URIs are considered to be the same non-information resource. > > We currently have the following: > > budapest.rkbexplorer.com > citeseer.rkbexplorer.com > cordis.rkbexplorer.com > darmstadt.rkbexplorer.com > dblp.rkbexplorer.com > deepblue.rkbexplorer.com > eurecom.rkbexplorer.com > ft.rkbexplorer.com > ibm.rkbexplorer.com > ieee.rkbexplorer.com > irit.rkbexplorer.com > italy.rkbexplorer.com > kaunas.rkbexplorer.com > laas.rkbexplorer.com > lisbon.rkbexplorer.com > newcastle.rkbexplorer.com > nsf.rkbexplorer.com > pisa.rkbexplorer.com > roma.rkbexplorer.com > southampton.rkbexplorer.com > ulm.rkbexplorer.com > wiki.rkbexplorer.com > > There are some quite big resources here: citeseer, cordis, dblp and > nsf are > a good size. > > They all use the same ontology (AKT Reference Ontology, with some > small > additions), which hopefully makes them a useful resource for > applications > that use ontology-mediated separate knowledge bases. > > There is also such an application: > http://www.rkbexplorer.com/explorer/ > Since we have rebuilt the knowledge bases to conform to linked data > standards, the search and CRS information is still being analysed, > and thus > this version of the RKB explorer does not yet present as unified a > view as > we would like. > For a better unified view, please see the old version at > http://resist.ecs.soton.ac.uk/explorer/ > > Best > Hugh > > -- > Hugh Glaser, Reader > Dependable Systems & Software Engineering > School of Electronics and Computer Science, > University of Southampton, > Southampton SO17 1BJ > Work: +44 (0)23 8059 3670, Fax: +44 (0)23 8059 3045 > Mobile: +44 (0)78 9422 3822, Home: +44 (0)23 8061 5652 > http://www.ecs.soton.ac.uk/~hg/ > > > > > > >
Received on Wednesday, 7 November 2007 21:46:23 UTC