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Provenance semirings
TLDR
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 semirings. Expand
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RQL: a declarative query language for RDF
TLDR
We propose a new RDF query language called RQL that enables to uniformly query both resource descriptions and schemas by means of RDF schemas. Expand
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The ICS-FORTH RDFSuite: Managing Voluminous RDF Description Bases
TLDR
We present RDFSuite, a suite of tools for RDF validation, storage and querying. Expand
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Update Exchange with Mappings and Provenance
TLDR
We consider systems for data sharing among heterogeneous peers related by a network of schema mappings. Expand
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Benchmarking Database Representations of RDF/S Stores
TLDR
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) storage of subsumption relationships, using (ID) or not (URI) identifiers to represent resources and (c) a hybrid of the schema- aware and schema-oblivious representations. Expand
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Querying the Semantic Web with RQL
TLDR
We propose RQL, a new query language adapting the functionality of semistructured or XML query languages to the peculiarities of RDF but also extending this functionality in order to uniformly query both RDF descriptions and schemas. Expand
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LogicBlox, Platform and Language: A Tutorial
TLDR
The modern enterprise software stack--a collection of applications supporting bookkeeping, analytics, planning, and forecasting for enterprise data--is in danger of collapsing under its own weight. Expand
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ORCHESTRA: facilitating collaborative data sharing
TLDR
We propose a model for a declarative, yet extremely flexible, approach to data sharing, called the collaborative data sharing system, or CDSS. Expand
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The RDFSuite: Managing Voluminous RDF Description Bases
TLDR
In this paper, we advocate the use of database technology to support declarative access, as well as, logical and physical independence for voluminous RDF description bases. Expand
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Optimizing taxonomic semantic web queries using labeling schemes
TLDR
We advocate for the use of labeling schemes for modeling these hierarchies in order to efficiently answer queries such as subsumption check, descendants, ancestors or nearest common ancestor, which usually require costly transitive closure computations. Expand
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