Unordered tree matching and ordered tree matching: the evaluation of tree pattern queries

2011 ◽  
Vol 1 (3) ◽  
pp. 254 ◽  
Author(s):  
Yangjun Chen ◽  
Leping Zou
Keyword(s):  
Tree Pattern ◽  
Ordered Tree ◽  
Unordered Tree

scholarly journals Indexing ordered trees for (nonlinear) tree pattern matching by pushdown automata

2012 ◽  
Vol 9 (3) ◽  
pp. 1125-1153
Author(s):  
J. Travnícek ◽  
J. Janousek ◽  
B. Melichar
Keyword(s):  
Pattern Matching ◽  
Data Structures ◽  
Input Pattern ◽  
Pushdown Automaton ◽  
Ordered Trees ◽  
Tree Pattern ◽  
Tree Patterns ◽  
Tree Pattern Matching ◽  
Ordered Tree ◽  
Pushdown Automata

Trees are one of the fundamental data structures used in Computer Science. We present a new kind of acyclic pushdown automata, the tree pattern pushdown automaton and the nonlinear tree pattern pushdown automaton, constructed for an ordered tree. These automata accept all tree patterns and nonlinear tree patterns, respectively, which match the tree and represent a full index of the tree for such patterns. Given a tree with n nodes, the numbers of these distinct tree patterns and nonlinear tree patterns can be at most 2n?1 +n and at most (2+v)n?1+2, respectively, where v is the maximal number of nonlinear variables allowed in nonlinear tree patterns. The total sizes of nondeterministic versions of the two pushdown automata are O(n) and O(n2), respectively. We discuss the time complexities and show timings of our implementations using the bit-parallelism technique. The timings show that for a given tree the running time is linear to the size of the input pattern.

Answering ordered tree pattern queries over fuzzy XML data

2014 ◽  
Vol 43 (2) ◽  
pp. 473-495 ◽  
Author(s):  
Jian Liu ◽  
Z. M. Ma ◽  
Xue Feng
Keyword(s):  
Xml Data ◽  
Tree Pattern ◽  
Fuzzy Xml ◽  
Ordered Tree

scholarly journals Limiting Until in Ordered Tree Query Languages

2016 ◽  
Vol 17 (2) ◽  
pp. 1-34
Author(s):  
Michael Benedikt ◽  
Clemens Ley
Keyword(s):  
Query Languages ◽  
Ordered Tree

Containment of partially specified tree-pattern queries in the presence of dimension graphs

2008 ◽  
Vol 18 (1) ◽  
pp. 233-254 ◽  
Author(s):  
Dimitri Theodoratos ◽  
Pawel Placek ◽  
Theodore Dalamagas ◽  
Stefanos Souldatos ◽  
Timos Sellis
Keyword(s):  
Tree Pattern

scholarly journals Monadic Datalog and Regular Tree Pattern Queries

2016 ◽  
Vol 41 (3) ◽  
pp. 1-43
Author(s):  
Filip Mazowiecki ◽  
Filip Murlak ◽  
Adam Witkowski
Keyword(s):  
Regular Tree ◽  
Tree Pattern

XMin: Minimizing Tree Pattern Queries with Minimality Guarantee

2010 ◽  
Vol 13 (3) ◽  
pp. 343-371 ◽  
Author(s):  
Ki-Hoon Lee ◽  
Kyu-Young Whang ◽  
Wook-Shin Han
Keyword(s):  
Tree Pattern
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