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Graal is a java toolkit dedicated to ontological query answering in the framework of existential rules. We consider knowledge bases composed of data and an ontology expressed by existential rules. The main features of Graal are the following: a basic layer that provides generic interfaces to store and query various kinds of data, forward chaining and query rewriting algorithms, structural analysis of decidability properties of a rule set, a textual format and its parser, and import of OWL 2 files. We describe in more detail the query rewriting algorithms, which rely on original techniques, and report some experiments.

This powerful reporting library aims to simplify producing reports using iText. The most demanding and coding intensive tasks when producing reports with iText are how to get from data to report elements, how to style those blocks and how to evaluate (debug) the resulting report layout. Exactly those three tasks are simplified by this library: xml configuration and/or annotations to transform existing Java data objects into report block, provide styling information (css like, syntax independent) seperate from code, a firebug like debug mode to help evaluate your report.