54 citations · 127 across the 12 of their papers we have counts for
4 papers · 1 filter
The multiset semantics of SPARQL patterns
Renzo Angles, Claudio Gutierrez
The paper determines the algebraic and logic structure of the multiset semantics of the core patterns of SPARQL. We prove that the fragment formed by AND, UNION, OPTIONAL, FILTER,…
Correlation and Substitution in SPARQL
Daniel Hernández, Claudio Gutierrez, Renzo Angles
In the current SPARQL specification the notion of correlation and substitution are not well defined. This problem triggers several ambiguities in the semantics. In fact, implementa…
Negation in SPARQL
Renzo Angles, Claudio Gutierrez
This paper presents a thorough study of negation in SPARQL. The types of negation supported in SPARQL are identified and their main features discussed. Then, we study the expressiv…
Group Centrality for Semantic Networks: a SWOT analysis featuring Random Walks
Camilo Garrido, Ricardo Mora, Claudio Gutierrez
Group centrality is an extension of the classical notion of centrality for individuals, to make it applicable to sets of them. We perform a SWOT (strengths, weaknesses, opportuniti…