Saxon
Optimizations and performance improvements
Handling of source documents
XPath 3.0 implementation
XSLT 2.0 implementation
Command line interfaces
XSLT 3.0 implementation
XQuery 3.0 implementation
XML Schema 1.1 implementation
Functions, operators, and data types for XPath 3.0
Saxon extensions to the W3C XSLT/XQuery specifications
Application Programming Interfaces
System Programming Interfaces