The market for Extensible Markup Language data storage technologies will rise to $4.1 billion by 2005 from only $75 million in 2000, a report by XML-focused industry analyst group ZapThink LLC finds. The rapid growth results from a need to maintain XML content beyond single transactions or interactions as XML proliferates in the enterprise, the Waltham, Mass-based analyst group concludes.

"Developers are taking advantage of XML's flexibility and extensibility in order to allow content to be shared, redistributed and recombined easily," says Ronald Schmelzer, senior analyst at ZapThink. "However, these attributes present challenges to current storage architectures. The way XML is used will dictate the characteristics of the storage technology chosen."

The "XML Data Storage Technologies and Trends" report says the primary XML document storage technologies in use today include XML-enabled or extended relational databases, native XML data stores, content management solutions and file systems.

The report also says that XML-enabled relational database management system vendors consumed only 15% of the RDBMS market in 2000 but will account for more than 65% of expenditures in 2005. RDBMS vendors will continue to add XML support to offer users a way to leverage existing storage investments, ZapThink says.

Native XML data stores or NXDs will increasingly become a solution of choice for storage of document-oriented XML content and Web services, business-to- business messaging and other transactional formats, the report finds. NXD vendors will have revenue of about $1.6 billion by 2005, ZapThink says.

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