XML stream processing using tree-edit distance embeddingsXML stream processing using tree-edit distance embeddings Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-292005enWe 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 L1 vector space while guaranteeing a (worst-case) upper bound of O(log2n log*n) on the distance distortion between any data trees with at most 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.http://creativecommons.org/licenses/by/4.0/ACM Transactions on Database Systems301279-332 Garofalakis Minos Γαροφαλακης Μινως Kumar Amit Association for Computing Machinery XML