String modelName = EOModelGroup.defaultGroup().entityNamed(entityName).model().name();
String modelName = EOModelGroup.modelGroupForObjectStoreCoordinator(osc).entityNamed(entityName).model().name();
        private static synchronized EODatabaseContext databaseContextForEntityNamed(String entityName, ObjectStoreCoordinator osc) {            String modelName = EOModelGroup.defaultGroup().entityNamed(entityName).model().name();            Hashtable h = osc.databaseContextsForModels();            EODatabaseContext dbc = (EODatabaseContext)h.get(modelName);            return dbc;        }