document: XQuery containment in presence of variable binding dependencies Semantic caching is an important technology for improving the response time of future user queries specified over remote servers . This paper deals with the fundamental query containment problem in an XQuery-based semantic caching system . To our best knowledge , the impact of subtle differences in XQuery semantics caused by different ways of specifying variables on query containment has not yet been studied . We introduce the concept of variable binding dependencies for representing the hierarchical element dependencies preserved by an XQuery . We analyze the problem of XQuery containment in the presence of such dependencies . We propose a containment mapping technique for nested XQuery in presence of variable binding dependencies . The implication of the nested block structure on XQuery containment is also considered . We mention the performance gains achieved by a semantic caching system we build based on the proposed technique .
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