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In a remarkably short period, XML has become the most important language for marking up documents for the Web as well as industry in general--and XML is rapidly becoming the lingua franca for marking up traditional business data, for exchanging information between business partners and application programs, and for expressing a host of concepts that improve the usability of computer systems. However good a tool it is, XML introduces tradeoffs and complications--and among the difficulties are ones posed by locating and retrieving information stored in documents marked up using XML.
This book teaches the most useful approaches to querying XML documents and repositories of such documents--to both identify documents and then to extract information from them. In addition, it offers perspective on some other technologies that are closely related as well as valuable insights in context about locating and retrieving XML documents. Presents the concepts clearly, and demonstrates them with illustrations and examples throughout; allows the software engineer a way to master this topic thoroughly in a single book.