Abstract
We address the XPath evaluation problem over XML streams. We consider a fragment of XPath called Conjunctive XPath (CXP). We present an algorithm that eagerly evaluates a CXP query Q against a streaming XML data D in O((|Q| + n 2)|D|) time and O(|Q|height(D) + n·maxcands(Q,D)) space, where n is the number of location steps in Q and maxcands(Q,D) is the maximum number of nodes of D that can be candidates for answer nodes, at any one instant. The result improves the previous work of Ramanan (2009) which lazily evaluates Q against D in O((|Q| + n·height(D))|D|) time using the same space.
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References
Gottlob, G., Koch, C., Pichler, R.: Efficient algorithms for processing XPath queries. ACM TODS 30(2), 444–491 (2005)
Gou, G., Chirkova, R.: Efficient algorithms for evaluating XPath over streams. In: SIGMOD 2007, pp. 269–280 (2007)
Hagio, K., Ohgami, T., Bannai, H., Takeda, M.: Efficient eager XPath filtering over XML streams. In: PSC 2011, pp. 30–44 (2011)
Kleene, S.: Introduction to Metamathematics. North-Holland, Amsterdam (1952)
Olteanu, D.: SPEX: Streamed and progressive evaluation of XPath. IEEE Transactions on Knowledge and Data Engineering 19(7), 934–949 (2007)
Ramanan, P.: Covering indexes for XML queries: Bisimulation - simulation = negation. In: VLDB 2003, pp. 165–176 (2003)
Ramanan, P.: Worst-case optimal algorithm for XPath evaluation over XML streams. J. Comput. Syst. Sci. 75(8), 465–485 (2009)
Ramanan, P.: Memory lower bounds for XPath evaluation over XML streams. J. Comput. Syst. Sci. 77(6), 1120–1140 (2011)
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© 2012 Springer-Verlag Berlin Heidelberg
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Hagio, K., Ohgami, T., Bannai, H., Takeda, M. (2012). Eager XPath Evaluation over XML Streams. In: Calderón-Benavides, L., González-Caro, C., Chávez, E., Ziviani, N. (eds) String Processing and Information Retrieval. SPIRE 2012. Lecture Notes in Computer Science, vol 7608. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34109-0_26
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DOI: https://doi.org/10.1007/978-3-642-34109-0_26
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