Complexity of Data Tree Patterns over XML Documents
Complexity of Data Tree Patterns over XML Documents
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DOI:
10.1007/978-3-540-85238-4_22
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发表时间:
2008-08
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影响因子:
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通讯作者:
C. David
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文献类型:
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作者:
C. David
We consider Boolean combinations of data tree patterns as a specification and query language for XML documents. Data tree patterns are tree patterns plus variable (in)equalities which express joins between attribute values. Data tree patterns are a simple and natural formalism for expressing properties of XML documents. We consider first the model checking problem (query evaluation), we show that it is DP-complete in general and alreadyNP-complete when we consider a single pattern. We then consider the satisfiability problem in the presence of a DTD. We show that it is in general undecidable and we identify several decidable fragments.