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MarkLogic - Schema-agnostic Enterprise NoSQL database technology, coupled w/ powerful search & flexible application services
BaseX - BaseX is a very light-weight, high-performance and scalable XML Database engine and XPath/XQuery...
InterSystems IRIS - InterSystems IRIS Data Platform sets a new level of performance for rapidly developing and deploying applications. Learn how it can help your organization.
Qizx - XML Databases
Apache Xerces - Advanced XML parser, including support for XML Schema, DOM Level 2, and SAX.
Sedna - XML Databases