Command line interfaces
XSLT 3.0 implementation
XPath 3.1 implementation
XQuery 1.0 implementation
XQuery 3.1 implementation
Functions, operators, and data types for XPath 3.1
Packaging, installation, and licensing changes
Serialization
Streamed processing of input documents
System Programming Interfaces
Saxon extensions to the W3C XSLT/XQuery specifications
Saxon SQL extension instructions
Extensibility mechanisms
Internal changes
XML Schema 1.0 implementation
S9API interface
Changes specific to .NET
Localization (natural language support)
Optimizations and performance improvements