Hi Cong, On 3/11/14, 10:09 AM, Magnus Knuth wrote: > > Am 09.03.2014 um 22:06 schrieb Cong Wang: > >> Hi Magnus, Heiko and Marco, > > Hello Cong Wang, > and welcome to DBpedia community. > >> My name is Cong Wang, a Ph.D. student from Wright State University with >> Pascal Hitzler. I am very interested in the two topics of gsoc 2014, >> "ontolocy consistency check" and "pattern discovery". I found the two topics >> are actually quite interactive, so I write this email to all of you. >> >> I had read the related papers. Pattern discovery and type inference are both >> about ontology enrichment (under a maximum likelihood manner) [1,2], And >> while ontology is automatically enriched, there can be inconsistency, say, >> enrichment will cause inconsistency. But on the other hand, enrichment will >> help for detecting potential inconsistency. Since the ontology is too big to >> put into any reasoners, so the idea is remove inconsistency by some >> "suggestions [3]". >> >> Now, I have an idea based on your methods. First design a set of patterns >> which itself is inconsistent (the patterns must be high frequent), then use >> some statistical method to extract axioms under these types, if there are >> axioms extracted with high probably, then we may argue there are potential >> conflicts. How do you think of this idea? > > Could you provide an example. How is a pattern inconsistent? What will be > done to axioms that are potentially conflicting? > > I think the first and main issue of this task is to develop a system to find > such axioms. These need to be evaluated and the removal of potential > incorrect axioms will be a postponed step. > >> I also have one question. In [4], I don't understand how the Airpedia >> project relates to consistency checking issues. Can you give me some more >> details? > > Afaik Airpedia generates extraction mappings for multiple languages, which is > a step prior to extraction, so there might be errors in the created mappings, > but no inconsistencies. We might get inconsistencies in the data extracted > afterwards. But that should be answered finally by @Marco, since I am not > involved in this project. The referred Airpedia dataset contains automatically generated instance type statements for different language chapters. By running some basic statistics over such dataset (e.g. absolute frequency), we can obtain a ranked list of actually used ontology classes. This is also complementary to more recent work by @Heiko [1]. I use the term 'consistency' in rather a shallow way. We want to check here the real-world usage of the DBpedia ontology. Sorry if such a term may be misinterpreted.
Cheers! [1] http://www.heikopaulheim.com/documents/iswc2013.pdf > > Best regards > Magnus > >> Thanks. >> >> [1]. Lorenz Bühmann, Jens Lehmann. Pattern Based Knowledge Base Enrichment. >> [2]. Heiko Paulheim, Christian Bizer: Type Inference on Noisy RDF Data. >> [3]. Gerald Töpper, Magnus Knuth, Harald Sack. DBpedia Ontology Enrichment >> for Inconsistency Detection >> [4]. http://wiki.dbpedia.org/gsoc2013/ideas/OntologyCheck?v=l3f >> >> Best regards. >> >> >> -- >> Cong Wang >> Ph.D Candidate, >> Kno.e.sis Center, >> Wright State University. > > > ------------------------------------------------------------------------------ > Learn Graph Databases - Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and their > applications. Written by three acclaimed leaders in the field, > this first edition is now available. Download your free book today! > http://p.sf.net/sfu/13534_NeoTech > _______________________________________________ > Dbpedia-gsoc mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/dbpedia-gsoc > -- Marco Fossati http://about.me/marco.fossati Twitter: @hjfocs Skype: hell_j ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Dbpedia-gsoc mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dbpedia-gsoc
