Documentation changes
Packaging, installation, and licensing changes
XSLT 3.0 implementation
XQuery 3.1 implementation
XPath 3.1 implementation
Functions, operators, and data types for XPath 3.1
XML Schema 1.1 implementation
XQuery Updates implementation
Serialization
Saxon extensions to the W3C XSLT/XQuery specifications
Saxon SQL extension instructions
S9API interface
Extensibility mechanisms
System Programming Interfaces
Optimizations and performance improvements
Handling of source documents