TY - CONF T1 - Semantic query optimization for object databases T2 - Data Engineering, 1997. Proceedings. 13th International Conference on Y1 - 1997 A1 - Grant,J. A1 - Gryz,J. A1 - Minker, Jack A1 - Raschid, Louiqa JA - Data Engineering, 1997. Proceedings. 13th International Conference on ER -