Node Query Preservation for Deterministic Linear Top-Down Tree Transducers

被引:2
|
作者
Miyahara, Kazuki [1 ]
Hashimoto, Kenji [2 ]
Seki, Hiroyuki [2 ]
机构
[1] Nara Inst Sci & Technol, Nara, Japan
[2] Nagoya Univ, Nagoya, Aichi, Japan
关键词
D O I
10.4204/EPTCS.134.4
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
This paper discusses the decidability of node query preservation problems for XML document transformations. We assume a transformation given by a deterministic linear top-down data tree transducer (abbreviated as DLTV) and an n-ary query based on runs of a tree automaton. We say that a DLTV Tr strongly preserves a query Q if there is a query Q' such that for every document t, the answer set of Q for Tr (t) is equal to the answer set of Q for t. Also we say that Tr weakly preserves Q if there is a query Q' such that for every t(d) in the range of Tr, the answer set of Q' for t(d) is equal to the union of the answer set of Q for t such that t(d) = Tr (t). We show that the weak preservation problem is coNP-complete and the strong preservation problem is in 2-EXPTIME.
引用
收藏
页码:27 / 37
页数:11
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