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Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of large volumes of metadata, i.e., information describing the available Web content and… (More)
- Todd J. Green, Gregory Karvounarakis, Val Tannen
- PODS
- 2007
We show that relational algebra calculations for incomplete databases, probabilistic databases, bag semantics and why-provenance are particular cases of the same general algorithms involving… (More)
We consider systems for data sharing among heterogeneous peers related by a network of schema mappings. Each peer has a locally controlled and edited database instance, but wants to ask queries over… (More)
Metadata are widely used in order to fully exploit information resources available on corporate intranets or the Internet. The Resource Description Framework (RDF) aims at facilitating the creation… (More)
- Gregory Karvounarakis, Aimilia Magkanaraki, +4 authors Karsten Tolle
- Computer Networks
- 2003
Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of voluminous repositories of resource metadata. The Resource Description Framework (RDF)… (More)
- Gregory Karvounarakis, Zachary G. Ives, Val Tannen
- SIGMOD Conference
- 2010
Many advanced data management operations (e.g., incremental maintenance, trust assessment, debugging schema mappings, keyword search over databases, or query answering in probabilistic databases),… (More)
- Yannis Theoharis, Vassilis Christophides, Gregory Karvounarakis
- International Semantic Web Conference
- 2005
In this paper we benchmark three popular database representations of RDF/S schemata and data: (a) a schema-aware (i.e., one table per RDF/S class or property) with explicit (ISA) or implicit (NOISA)… (More)
Metadata are widely used in order to fully exploit information resources available on corporate intranets or the Internet. The Resource Description Framework (RDF) aims at facilitating the creation… (More)
- Todd J. Green, Gregory Karvounarakis, Nicholas E. Taylor, Olivier Biton, Zachary G. Ives, Val Tannen
- SIGMOD Conference
- 2007
One of the most elusive goals of structured data management has been sharing among large, heterogeneous populations: while data integration [4, 10] and exchange [3] are gradually being adopted by… (More)
- Gregory Karvounarakis, Todd J. Green
- SIGMOD Record
- 2012
We present an overview of the literature on querying semiring-annotated data, a notion we introduced five years ago in a paper with Val Tannen. First, we show that positive relational algebra… (More)