NDLI: Analysis of declarative updates: invited talk

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Analysis of declarative updates: invited talk

Content Provider	ACM Digital Library
Author	Benedikt, Michael
Abstract	Declarative XML update languages are harder to analyze than queries. Static type inference and type checking are certainly more difficult, and even more basic effect analysis problems are complex -- what parts of a document does an update impact? I will begin by surveying the previous results on analysis of XML updates, and their relation to problems in XPath/XQuery. I will then focus on one interaction problem: do an update and a query interact? I will explain why this problem lies at the core of many optimization problems, particularly view maintenance under declarative updates and minimization of number of passes in update evaluation. The query/update interaction problem is particularly interesting in that it requires re-examining the notion of query provenance. What does it mean precisely for a query to read or depend-on one portion of the document? In the second part of the talk I present a framework for describing the dependence of a query on a document in terms of updates. The framework makes sense for any data model, but instantiated for XML it gives an approach to update interaction problems. I will go through the basic theory, and then the specifics of our implementation for a fragment of the w3cs XML Update Facility. I will report on a prototype implementation of our interaction analysis, including experiments showing its impact on incremental maintenance. I will close with a discussion of open issues, both on the theoretical and practical side. This is joint work with James Cheney.
Starting Page	1
Ending Page	1
Page Count	1
File Format	PDF
ISBN	9781605589909
DOI	10.1145/1754239.1754259
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-03-22
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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