Browsing by Author "Arenas, Marcelo"

Now showing items 1-7 of 7

    • Counting Beyond a Yottabyte, or how SPARQL 1.1 Property Paths will Prevent Adoption of the Standard 
      Arenas, Marcelo; Conca, Sebastián; Pérez Rojas, Jorge (2012-04)
      SPARQL –the standard query language for querying RDF– provides only limited navigational functionalities, although these features are of fundamental importance for graph data formats such as RDF. This has led the W3C ...
    • Cómo funciona la web 
      Arenas, Marcelo; Baeza Yates, Ricardo; Gutiérrez Gallardo, Claudio; Hurtado Larraín, Carlos; Marín, Mauricio; Navarro, Gonzalo; Piquer Gardner, José; Rodríguez Tastets, M. Andrea; Ruiz del Solar, Javier; Velasco, Javier (Centro de Investigación de la Web, Departamento de Ciencias de la Computación, Universidad de Chile, 2008)
    • Game-based notions of locality over finite models 
      Arenas, Marcelo; Barceló Baeza, Pablo; Libkin, Leonid (ELSEVIER, 2008-03)
      Locality notions in logic say that the truth value of a formula can be determined locally, by looking at the isomorphism type of a small neighbourhood of its free variables. Such notions have proved to be useful in many ...
    • The language of plain SO-tgds: Composition, inversion and structural properties 
      Arenas, Marcelo; Pérez Rojas, Jorge; Reutter, Juan; Riveros, Cristian (Elsevier, 2013)
      The problems of composing and inverting schema mappings specified by source-to-target tuple-generating dependencies (st-tgds) have attracted a lot of attention, as they are of fundamental importance for the development ...
    • Screening of COVID-19 cases through a Bayesian network symptoms model and psychophysical olfactory test 
      Eyheramendy, Susana; Saa, Pedro A.; Undurraga, Eduardo A.; Valencia, Carlos; López, Carolina; Méndez, Luis; Pizarro Berdichevsky, Javier Alejandro; Finkelstein Kulka, Andrés; Solari, Sandra; Salas, Nicolás; Bahamondes, Pedro; Ugarte, Martín; Barceló, Pablo; Arenas, Marcelo; Agosín, Eduardo (Cell, 2021)
      The sudden loss of smell is among the earliest and most prevalent symptoms of COVID-19 when measured with a clinical psychophysical test. Research has shown the potential impact of frequent screening for olfactory ...
    • Semantics and Complexity of SPARQL 
      Pérez Rojas, Jorge; Arenas, Marcelo; Gutiérrez Gallardo, Claudio (ASSOC COMPUTING MACHINERY, 2009-08)
      SPARQL is the W3C candidate recommendation query lan- guage for RDF. In this paper we address systematically the formal study of SPARQL, concentrating in its graph pattern facility. We consider for this study simple RDF ...
    • Some Remarks on the Paper "semQA: SPARQL with Idempotent Disjunction" 
      Arenas, Marcelo; Gutiérrez Gallardo, Claudio; Pérez Rojas, Jorge (IEEE COMPUTER SOC, 2011-04)
      In the paper, "semQA: SPARQL with Idempotent Disjunction" [4], the authors study the RDF query language SPARQL. In particular, they claim that some of the results presented in [1] are not correct. In this note, we refute ...