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On labeling schemes for the semantic web

11 years 1 months ago
On labeling schemes for the semantic web
This paper focuses on the optimization of the navigation through voluminous subsumption hierarchies of topics employed by Portal Catalogs like Netscape Open Directory (ODP). We advocate for the use of labeling schemes for modeling these hierarchies in order to e ciently answer queries such as subsumption check, descendants, ancestors or nearest common ancestor, which usually require costly transitive closure computations. We rst give a qualitative comparison of three main families of schemes, namely bit vector, pre x and interval based schemes. We then show that two labeling schemes are good candidates for an e cient implementation of label querying using standard relational DBMS, namely, the Dewey Pre x scheme 6] and an Interval scheme by Agrawal, Borgida and Jagadish 1]. We compare their storage and query evaluation performance for the 16 ODP hierarchies using the PostgreSQL engine. Categories and Subject Descriptors H.2.3 Information Systems]: Database Management-Query Languages Ge...
Vassilis Christophides, Dimitris Plexousakis, Mich
Added 22 Nov 2009
Updated 22 Nov 2009
Type Conference
Year 2003
Where WWW
Authors Vassilis Christophides, Dimitris Plexousakis, Michel Scholl, Sotirios Tourtounis
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