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Definition
Active XML documents (AXML documents, for short) are XML documents [12] that may include embedded calls to Web services [13]. Hence, AXML documents are a combination of regular “extensional” XML data with data that is defined “intensionally,” i.e., as a description that enables obtaining data dynamically (by calling the corresponding service).
AXML documents evolve in time when calls to their embedded services are triggered. The calls may bring data once (when invoked) or continually (e.g., if the called service is a continuous one, such as a subscription to an RSS feed). They may even update existing parts of the document (e.g., by refreshing previously fetched data).
Historical Background
The AXML language was originally proposed at INRIA around 2002. Work around AXML has been going there in the following years. A survey of the research on AXML is given in [13]. The software, primarily under the form of an AXML system, is available as open...
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Recommended Reading
Abiteboul S., Abrams Z., and Milo T. Diagnosis of Asynchronous Discrete Event Systems – Datalog to the Rescue! In Proc. 24th ACM SIGACT-SIGMOD-SIGART Symp. on Principles of Database Systems, 2005, pp. 358–367.
Abiteboul S., Benjelloun O., Cautis B., Manolescu I., Milo T., and Preda N. Lazy Query Evaluation for Active XML. In Proc. ACM SIGMOD Int. Conf. on Management of Data, 2004, pp. 227–238.
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DXQ: Managing Distributed System Resources with Distributed XQuery. http://db.ucsd.edu/dxq/
Loo B.T., Condie T., Garofalakis M., Gay D.E, Hellerstein J.M., Maniatis P., Ramakrishnan R., Roscoe T., and Stoica I. In Proc. ACM SIGMOD Int. Conf. on Management of Data, 2006, pp. 97–108.
Milo T., Abiteboul S., Amann B., Benjelloun O., and Ngoc F.D. Exchanging Intensional XML data. In Proc. ACM SIGMOD Int. Conf. on Management of Data, 2003, pp. 289–300.
Nigam A. and Caswell N.S. Business artifacts: an approach to operational specification. IBM Syst. J., 42(3):428–445, 2003.
The Active XML homepage. http://www.activexml.net/
The Extensible Markup Language (XML) 1.0 (2nd edn). http://www.w3.org/TR/REC-xml
The W3C Web Services Activity. http://www.w3.org/2002/ws
The XQuery language. http://www.w3.org/TR/xquery
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Abiteboul, S., Benjelloun, O., Milo, T. (2009). Active XML. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_782
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DOI: https://doi.org/10.1007/978-0-387-39940-9_782
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