Oracle DB (Not XDB) IBM Db2 Microsoft SQL Server Sybase ASE Informix MySQL PostgreSQL Non-database implementations The following is a list of non-database XQuery processors which provide an XQuery API for Java interface (typically allowing query against documents parsed from XML in filestore, and held in memory as DOM or similar trees). Saxon XSLT and XQuery processor Zorba MXQuery Oracle XQuery Processor License The specification is marked as "Copyright © 2003, 2006 - 2009 Oracle. All rights reserved." The specification contains two separate licenses: a "specification license" and a "reference implementation license". The specification license allows free copying of the specification provided that copyright notices are retained; it also grants a license to create and distribute an implementation of the specification provided that it fully implements the entire specification, that it does not modify or extend any interfaces, and that it passes the compatibility tests. This provision has caused some controversy. Firstly, it is not universally accepted that implementing a published specification is something that requires a license (that is, that copyright law would disallow this in the absence of a license). Secondly, the license does not meet the criteria to qualify as an open source license (see Open Source Definition), because of the ban on making extensions and modifications. This has led some open source enthusiasts to challenge whether XQJ implementations can ever be considered truly open source. The license for the reference implementation is a fairly conventional BSD-style open source license. References External links Javadoc for XQJ XQJ Tutorial Building Bridges from Java to XQuery, Charles Foster. XML Prague 2012 (Prezi Presentation) Java Integration of XQuery, Hans-Jürgen Rennau. Balisage 2010 Orbeon Forms using XQJ Spring Integration XQuery Support XQS: XQuery for Scala (Sits on top of XQJ) IntelliJ XQuery Support plugin Java APIs Java specification requests XML data access Java API for XML Database APIs