let sprintf_refObj_index_drop name = [
sprintf "DROP INDEX %s_source ON %s;" name name ;
sprintf "DROP INDEX %s_target ON %s;" name name ;
sprintf "DROP INDEX %s_position ON %s;" name name ]
let sprintf_refObj_index_drop name = [
sprintf "DROP INDEX %s_source ON %s;" name name ;
sprintf "DROP INDEX %s_target ON %s;" name name ;
sprintf "DROP INDEX %s_position ON %s;" name name ]