14 citations · 34 across the 5 of their papers we have counts for
5 papers
Query Rewriting and Optimization for Ontological Databases
Georg Gottlob, Giorgio Orsi, Andreas Pieris
Ontological queries are evaluated against a knowledge base consisting of an extensional database and an ontology (i.e., a set of logical assertions and constraints which derive new…
AMBER: Automatic Supervision for Multi-Attribute Extraction
Tim Furche, Georg Gottlob, Giovanni Grasso +3
The extraction of multi-attribute objects from the deep web is the bridge between the unstructured web and structured data. Existing approaches either induce wrappers from a set of…
The Ontological Key: Automatically Understanding and Integrating Forms to Access the Deep Web
Tim Furche, Georg Gottlob, Giovanni Grasso +3
Forms are our gates to the web. They enable us to access the deep content of web sites. Automatic form understanding provides applications, ranging from crawlers over meta-search e…
Heuristic Ranking in Tightly Coupled Probabilistic Description Logics
Thomas Lukasiewicz, Maria Vanina Martinez, Giorgio Orsi +1
The Semantic Web effort has steadily been gaining traction in the recent years. In particular,Web search companies are recently realizing that their products need to evolve towards…
Ontological Queries: Rewriting and Optimization (Extended Version)
Georg Gottlob, Giorgio Orsi, Andreas Pieris
Ontological queries are evaluated against an ontology rather than directly on a database. The evaluation and optimization of such queries is an intriguing new problem for database…