232 citations · 250 across the 9 of their papers we have counts for
5 papers · 1 filter
Keyword Search in the Deep Web
Andrea Calì, Davide Martinenghi, Riccardo Torlone
The Deep Web is constituted by data that are accessible through Web pages, but not readily indexable by search engines as they are returned in dynamic pages. In this paper we propo…
A Hybrid Approach to Query Answering under Expressive Datalog+/-
Mostafa Milani, Andrea Cali, Leopoldo Bertossi
Datalog+/- is a family of ontology languages that combine good computational properties with high expressive power. Datalog+/- languages are provably able to capture the most relev…
Deep Separability of Ontological Constraints
Andrea Calì, Marco Console, Riccardo Frosini
When data schemata are enriched with expressive constraints that aim at representing the domain of interest, in order to answer queries one needs to consider the logical theory con…
Containment of Schema Mappings for Data Exchange (Preliminary Report)
Andrea Calì, Riccardo Torlone
In data exchange, data are materialised from a source schema to a target schema, according to suitable source-to-target constraints. Constraints are also expressed on the target sc…
Querying Incomplete Data over Extended ER Schemata
Andrea Cali, Davide Martinenghi
Since Chen's Entity-Relationship (ER) model, conceptual modeling has been playing a fundamental role in relational data design. In this paper we consider an extended ER (EER) model…