Skip to Main content Skip to Navigation
New interface
Journal articles

Visibly Tree Automata with Memory and Constraints

Abstract : Tree automata with one memory have been introduced in 2001. They generalize both pushdown (word) automata and the tree automata with constraints of equality between brothers of Bogaert and Tison. Though it has a decidable emptiness problem, the main weakness of this model is its lack of good closure properties. We propose a generalization of the visibly pushdown automata of Alur and Madhusudan to a family of tree recognizers which carry along their (bottom-up) computation an auxiliary unbounded memory with a tree structure (instead of a symbol stack). In other words, these recognizers, called Visibly Tree Automata with Memory (VTAM) define a subclass of tree automata with one memory enjoying Boolean closure properties. We show in particular that they can be determinized and the problems like emptiness, membership, inclusion and universality are decidable for VTAM. Moreover, we propose several extensions of VTAM whose transitions may be constrained by different kinds of tests between memories and also constraints a la Bogaert and Tison. We show that some of these classes of constrained VTAM keep the good closure and decidability properties, and we demonstrate their expressiveness with relevant examples of tree languages.
Document type :
Journal articles
Complete list of metadata

Cited literature [21 references]  Display  Hide  Download
Contributor : Florent Jacquemard Connect in order to contact the contributor
Submitted on : Tuesday, March 22, 2011 - 2:38:17 PM
Last modification on : Wednesday, October 26, 2022 - 3:54:57 AM
Long-term archiving on: : Thursday, June 23, 2011 - 2:45:08 AM


Files produced by the author(s)



Hubert Comon-Lundh, Florent Jacquemard, Nicolas Perrin. Visibly Tree Automata with Memory and Constraints. Logical Methods in Computer Science, 2008, 4 (2), ⟨10.2168/LMCS-4(2:8)2008⟩. ⟨inria-00578844⟩



Record views


Files downloads