[ACM Press the Joint Meeting of the Twenty-Third EACSL Annual Conference - Vienna, Austria (2014.07.14-2014.07.18)] Proceedings of the Joint Meeting of the Twenty-Third EACSL Annual Conference on Computer Science Logic (CSL) and the Twenty-Ninth Annual ACM/IEEE Symposium on Logic in Computer Science (LICS) - CSL-LICS '14 - On the succinctness of query rewriting over shallow ontologies