講演抄録/キーワード |
講演名 |
2016-03-10 10:25
On the query preservation for nondeterministic tree transducers ○Kazuki Miyahara(NAIST)・Kenji Hashimoto(Nagoya Univ.)・Hiroyuki Seki(NAIST/Nagoya Univ.) SS2015-79 |
抄録 |
(和) |
We consider the problem of deciding whether a query can be rewritten by a nondeterministic view. It is known that rewriting is decidable if views are given by single-valued non-copying devices such as compositions of single-valued extended linear top-down tree transducers with regular look-ahead, and queries are given by deterministic MSO tree transducers. In this paper, we extend the result to the case that views are given by nondeterministic devices that are not always single-valued. We define two variants of rewriting: universal preservation and existential preservation, and discuss the decidability of them. |
(英) |
We consider the problem of deciding whether a query can be rewritten by a nondeterministic view. It is known that rewriting is decidable if views are given by single-valued non-copying devices such as compositions of single-valued extended linear top-down tree transducers with regular look-ahead, and queries are given by deterministic MSO tree transducers. In this paper, we extend the result to the case that views are given by nondeterministic devices that are not always single-valued. We define two variants of rewriting: universal preservation and existential preservation, and discuss the decidability of them. |
キーワード |
(和) |
tree transducers / query rewriting / query preservation / / / / / |
(英) |
tree transducers / query rewriting / query preservation / / / / / |
文献情報 |
信学技報, vol. 115, no. 508, SS2015-79, pp. 19-24, 2016年3月. |
資料番号 |
SS2015-79 |
発行日 |
2016-03-03 (SS) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
SS2015-79 |