Examinando Presentaciones a Congresos por Materia "ALGEBRA"
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- Ponencia en CongresoQuerying semantic web data cubes(2016) Etcheverry, Lorena; Vaisman, Alejandro Ariel"We address the problem of querying data cubes for Online Analytical Processing (OLAP) analysis, directly on the Semantic Web (SW). We rst introduce CQL, a simple algebra for querying data cubes at a conceptual level. Taking advantage of QB4OLAP metadata, we automatically translate CQL queries into SPARQL ones, and propose query optimization strategies that adapt, to the particular OLAP set ting, general-purpose techniques. A web application allows exploring and querying OLAP cubes on the SW, using the machinery presented here."
- Ponencia en CongresoAn RDF vocabulary for meta-programming with SPARQL algebra(2016) Ceriani, Miguel; Vaisman, Alejandro Ariel"SPARQL queries can be represented in RDF in order to work with them as first-class citizen in Semantic Web applications. The representation used so far, SPIN SPARQL, closely follows the abstract syntax tree, but fails to di rectly capture the semantics and is hard to work with for query rewriting. Here a novel vocabulary based on SPARQL Algebra is presented. The adequacy of the language is empirically shown through a few examples. "