free ebook and tutorial - XML with SQL

Most business data are stored in relational database systems, and SQL (Structured Query Language) isused for data retrieval and manipulation. With XML (Extensible Markup Language) rapidly becoming the defacto standard for retrieving and exchanging data, new functionality is expected from traditional databases. Existing SQL applications will evolve to retrieve relational data as XML data using database or SQL extensions for XML. New XML data will be stored, searched, and manipulated in the database as a “first class” citizen along with existing relational data.

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