Query languages

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Artículos en la categoría Query languages publicados en las Actas de las XX Jornadas de Programación y Lenguajes (PROLE 2021).
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  • Artículo
    Declarative Debugging of SPARQL Queries
    Almendros-Jimenez, Jesus M.; Becerra-Teron, Antonio. Actas de las XX Jornadas de Programación y Lenguajes (PROLE 2021), 2021-09-22.
    The debugging of database queries is a research topic of increasing interest in recent years. The Semantic Web query language SPARQL should be equipped with a debugger for helping users to detect bugs which usually cause empty results as well as wrong and missing answers. Declarative debugging is a well-known debugging method successfully used in other database query languages. In this paper we present a declarative debugger for SPARQL. The debugging is based on the building of a debugging tree, and the detection of buggy and failure nodes in the debugging tree causing empty results as well as wrong and missing answers. The debugger has been implemented and it is available as Web tool.
  • Resumen
    Flexible Aggregation in FSA-SPARQL
    Almendros-Jimenez, Jesus M.; Becerra-Teron, Antonio; Moreno, Gines; Riaza Valverde, José Antonio. Actas de las XX Jornadas de Programación y Lenguajes (PROLE 2021), 2021-09-22.
    Aggregation is a very useful operation in database query languages. Through count, sum, min, max and avg operators database instances can be counted and summarized. Attached to such operators, group by and having clauses make it possible to define partitions on database instances as well as filter partitions according to Boolean conditions. In this paper, we define aggregation operators for the language FSA-SPARQL, which is a fuzzy extension of the Semantic Web query language SPARQL. We present the semantics of such operators with regard to fuzzy RDF triple patterns. We also provide mechanisms in FSA-SPARQL for the partition of fuzzy RDF triple patterns with regard to fuzzy sets, as well as for the filtering of partitions. The proposed extension has been implemented and it can be tested from the FSA-SPARQL Web site. Paper accepted in IEEE International Conf. on Fuzzy Systems 2021 https://attend.ieee.org/fuzzieee-2021/