Publish/subscribe (pub/sub) middleware facilitates loosely coupled cooperation and fits well the needs of spontaneous, ad-hoc interaction. However, newly started mobile applicati...
Mariano Cilia, Ludger Fiege, C. Haul, Andreas Zeid...
STEP is an ISO standard (ISO-10303) for the computerinterpretable representation and exchange of product data. Parts of STEP standardize conceptual structures and usage ofinformat...
We study the complexity of the problem of answering queries using materialized views. This problem has attracted a lot of attention recently because of its relevance in data integ...
We address the problem of answering conjunctive queries over knowledge bases, specified by sets of first-order sentences called tuple-generating dependencies (TGDs). This problem i...
We discuss the problems associated with managing ontologies in distributed environments such as the Web. The Web poses unique problems for the use of ontologies because of the rap...