Saxon
S9API interface
JAXP interface (transformation, XPath, schema processing)
Command line interfaces
Saxon extensions to the W3C XSLT/XQuery specifications
Extensibility mechanisms
Optimizations and performance improvements
XML Schema 1.1 implementation
XSLT 3.0 implementation
Streamed processing of input documents
XPath 3.0 implementation
XQuery 3.0 implementation
Functions, operators, and data types for XPath 3.0
Internal changes
XQJ (JSR 225) interface
Handling of source documents
Localization (natural language support)