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XQuery delivers a carefully-paced tutorial that teaches everything a developer needs to start querying XML and databases. Learn how to join multiple data sources or hugely disparate data sources and documents, quickly sort the results or find query errors based on the data schema, and query elements differently depending on their type. This book covers the most useful functions of XQuery and explains how to query a variety of relational and XML sources. It also includes specific sections on learning XQuery for SQL and XSLT programmers.