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As information on the world wide web continues to proliferate at an astounding rate, the extensible markup language (XML) has been emerging as a standard format for data representation on the web. In many applications, specific document type definitions (DTDs) are designed to enforce a semantically agreed-upon structure of the XML documents for management.(More)
Oxidative stress is a major component of harmful cascades activated in neurodegenerative disorders. We sought to elucidate possible effects of forsythiaside, an active constituent isolated from the Chinese medicinal herb Forsythia suspense, on hydrogen peroxide (H2O2)-induced cell death and to determine the underlying molecular mechanisms in neuron-like(More)
We study XML stream-specific schema-based optimization. We assume a widely-adopted automata-based execution model for XQuery evaluation. Criteria are established regarding what schema constraints are useful to a particular query. How to apply multiple optimization techniques on an XQuery is then addressed. Finally we present how to correctly and efficiently(More)
When updating a valid XML document, an efficient yet light-weight mechanism is needed to determine if the up-date would invalidate the document. Towards this goal, we developed a framework called SAXE, we first analyzed the constraints expressed in XML schema specifications and establish constraint rules that must be observed for an XML document to conform(More)
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This paper describes cost-based query transformation in Oracle relational database system, which is a novel phase in query optimization. It discusses a suite of heuristic- and cost-based transformations performed by Oracle. It presents the framework for cost-based query transformation, the need for such a framework, possible interactions among some of the(More)
XML stream applications bring the challenge of efficiently processing queries on sequentially accessible token-based data streams. The automata paradigm is naturally suited for pattern recognition on tokenized XML streams, but requires patches for fulfilling the filtering or restructuring functionalities in the XML query language. In contrast, the algebraic(More)