We have developed a data stream management system that supports declarative stream queries running over high data volumes in a supercomputing environment. To enable specification ...
Due to the popularity of the XML data format, several query languages for XML have been proposed, specially devised to handle data whose structure is unknown, loose, or absent. Wh...
Daniela Florescu, Donald Kossmann, Ioana Manolescu
This paper introduces a description language for syntactically annotated corpora which allows for encoding both the syntactic annotation to a corpus and the queries to a syntactic...
The EU project Twenty-One will support cross language queries in a multilingual document base. A prototype version of the Twenty-Onesystem has been subjected to the Cross Language...
We give an AC0 upper bound on the complexity of rst-oder queries over (in nite) databases de ned by restricted linear constraints. This result enables us to deduce the non-expressi...