The Expressive Power of Higher-Order Datalog
The Expressive Power of Higher-Order Datalog
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高阶数据记录的表达能力
DOI:
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发表时间:
2019
影响因子:
1.4
通讯作者:
P. Rondogiannis
中科院分区:
文献类型:
--
作者:
A. Charalambidis;C. Nomikos;P. Rondogiannis
Abstract A classical result in descriptive complexity theory states that Datalog expresses exactly the class of polynomially computable queries on ordered databases (Papadimitriou 1985; Grädel 1992; Vardi 1982; Immerman 1986; Leivant 1989). In this paper we extend this result to the case of higher-order Datalog. In particular, we demonstrate that on ordered databases, for all k ≥ 2, k-order Datalog captures (k − 1)-EXPTIME. This result suggests that higher-order extensions of Datalog possess superior expressive power and they are worthwhile of further investigation both in theory and in practice.