Packaging, installation, and licensing changes
XSLT 3.0 implementation
XPath 3.1 implementation
Functions, operators, and data types for XPath 3.1
XML Schema 1.1 implementation
Serialization
Saxon extensions to the W3C XSLT/XQuery specifications
S9API interface
Changes specific to .NET
Command line interfaces
Extensibility mechanisms
System Programming Interfaces
Optimizations and performance improvements
Handling of source documents