Now showing items 1-2 of 2

  • Ontop: Answering SPARQL queries over relational databases 

    Calvanese D; Cogrel B; Komla-Ebri S; Kontchakov R; Lanti D; Rezk M; Rodriguez-Muro M; Xiao G (2017)
    We present Ontop, an open-source Ontology-Based Data Access (OBDA) system that allows for querying relational data sources through a conceptual representation of the domain of interest, provided in terms of an ontology, ...
  • Reliable Multidimensional Data Summaries Using Histograms 

    Shekelyan, Michael (Free University of Bozen-Bolzano, 2018)
    The main focus of this thesis is the data summary problem, where one takes a large set of multidimensional data points in the Euclidean space, creates a data summary that is much smaller and then uses only the summary to ...