Michael Kay has released Saxon 7.9, an experimental open source implementation of large parts of XSLT 2.0, XPath 2.0, and XQuery in Java. According to Kay, version 7.9 "is not yet the schema-aware version, but it contains the structural changes needed to prepare the way for schema awareness. It kills all known bugs, and fills in a number of gaps in the coverage of the XSLT 2.0 and XQuery 1.0 specifications." Java 1.4 is required. Saxon is published under the Mozilla Public License 1.0. However, a "schema-aware version of the product is planned: this will be a commercial product available from Saxonica Limited."