【摘 要】
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We propose a three-step technique to achieve this purpose.First, we utilize a collection of XML namespaces organized into hierarchical structure as a medium for
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We propose a three-step technique to achieve this purpose.First, we utilize a collection of XML namespaces organized into hierarchical structure as a medium for expressing data semantics.Second, we define the format of resource descriptor for the information source discovery scheme so that we can dynamically register and/or deregister the Web data sources on the fly.Third, we employ an inverted-index mechanism to identify the subset of information sources that are relevant to a particular user query.We describe the design, architecture, and implementation of our approach--IWDS, and illustrate its use through case examples.
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