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Multidimensional RDF
(2005)
RDF has been proposed by W3C as a metadata model and language for representing information about resources in WWW. In this paper we introduce Multidimensional RDF (or MRDF), as an extension of RDF, suitable for representing ...
View selection for real conjunctive queries
(2007)
Given a query workload, a database and a set of constraints, the view-selection
problem is to select views to materialize so that the constraints are satisfied and the views
can be used to compute the queries in the workload ...
Representing and querying histories of semistructured databases using multidimensional OEM
(2004)
Multidimensional semistructured data (MSSD) are semistructured data that present different facets under different contexts. Context represents alternative worlds, and is expressed by assigning values to a set of user-defined ...
Temporal stratification tests for linear and branching-time deductive databases
(2005)
We consider the problem of extending temporal deductive databases with stratified negation. We argue that the classical stratification test for deductive databases is too restrictive when one shifts attention to the temporal ...
Query containment under bag and bag-set semantics
(2010)
Conjunctive queries (CQs) are at the core of query languages encountered in many logic-based research fields such as AI, or database systems. The majority of existing work assumes set semantics but often in real applications ...