2 citations · 3 across the 5 of their papers we have counts for
5 papers
Expressiveness within Sequence Datalog
Heba Aamer, Jan Hidders, Jan Paredaens +1
Motivated by old and new applications, we investigate Datalog as a language for sequence databases. We reconsider classical features of Datalog programs, such as negation, recursio…
J-Logic: a Logic for Querying JSON
Jan Hidders, Jan Paredaens, Jan Van den Bussche
We propose a logical framework, based on Datalog, to study the foundations of querying JSON data. The main feature of our approach, which we call J-Logic, is the emphasis on paths.…
Structural characterizations of the navigational expressiveness of relation algebras on a tree
George H. L. Fletcher, Marc Gyssens, Jan Paredaens +2
Given a document D in the form of an unordered node-labeled tree, we study the expressiveness on D of various basic fragments of XPath, the core navigational language on XML docume…
Instance-Independent View Serializability for Semistructured Databases
Stijn Dekeyser, Jan Hidders, Jan Paredaens +1
Semistructured databases require tailor-made concurrency control mechanisms since traditional solutions for the relational model have been shown to be inadequate. Such mechanisms n…
Solving equations in the relational algebra
Joachim Biskup, Jan Paredaens, Thomas Schwentick +1
Enumerating all solutions of a relational algebra equation is a natural and powerful operation which, when added as a query language primitive to the nested relational algebra, yie…