Matching subsequences in trees

Authors:
Philip Bille;Inge Li Gørtz
Affiliations:
The IT University of Copenhagen, Rued Langgaards Vej 7, DK-2300 Copenhagen S, Denmark;Technical University of Denmark, Department of Informatics and Mathematical Modelling, Building 322, DK-2800 Kgs. Lyngby, Denmark
Venue:
Journal of Discrete Algorithms
Year:
2009

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Abstract

Given two rooted, labeled trees P and T the tree path subsequence problem is to determine which paths in P are subsequences of which paths in T. Here a path begins at the root and ends at a leaf. In this paper we propose this problem as a useful query primitive for XML data, and provide new algorithms improving the previously best known time and space bounds.