Introduction
by James McGovern
XML is an extremely versatile markup language, capable of labeling the information content of diverse data sources, including structured and semi-structured documents, relational databases, and object repositories. A query language that uses the structure of XML can intelligently express queries across all of these kinds of data, whether physically stored in XML, or viewed as XML via middleware. Query languages have traditionally been designed for specific kinds of data. Existing proposals for XML query languages are robust for particular types of data sources, but weak for other types. The XQuery specification is designed to be broadly applicable across all types of XML data sources.
The XQuery specification is one ...
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