NDLI: XML stream processing using tree-edit distance embeddings

Content Provider	ACM Digital Library
Author	Garofalakis, Minos Kumar, Amit
Copyright Year	2005
Abstract	We propose the first known solution to the problem of correlating, in small space, continuous streams of XML data through approximate (structure and content) matching, as defined by a general tree-edit distance metric. The key element of our solution is a novel algorithm for obliviously embedding tree-edit distance metrics into an $\textit{L}1$ vector space while guaranteeing a (worst-case) upper bound of $O(log^{2}n$ $log*\textit{n})$ on the distance distortion between any data trees with at most $\textit{n}$ nodes. We demonstrate how our embedding algorithm can be applied in conjunction with known random sketching techniques to (1) build a compact synopsis of a massive, streaming XML data tree that can be used as a concise surrogate for the full tree in approximate tree-edit distance computations; and (2) approximate the result of tree-edit-distance similarity joins over continuous XML document streams. Experimental results from an empirical study with both synthetic and real-life XML data trees validate our approach, demonstrating that the average-case behavior of our embedding techniques is much better than what would be predicted from our theoretical worst-case distortion bounds. To the best of our knowledge, these are the first algorithmic results on low-distortion embeddings for tree-edit distance metrics, and on correlating (e.g., through similarity joins) XML data in the streaming model.
Starting Page	279
Ending Page	332
Page Count	54
File Format	PDF
ISSN	03625915
e-ISSN	15574644
DOI	10.1145/1061318.1061326
Volume Number	30
Issue Number	1
Journal	ACM Transactions on Database Systems (TODS)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-03-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	XML Approximate query processing Data streams Data synopses Metric-space embeddings Tree-edit distance
Content Type	Text
Resource Type	Article
Subject	Information Systems

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