Command line interfaces
XSLT 3.0 implementation
XSLT 2.0 implementation
XPath 3.0 implementation
XPath 3.1 implementation
XQuery 1.0 implementation
XQuery 3.0 implementation
XQuery 3.1 implementation
Functions, operators, and data types for XPath 3.1
Packaging, installation, and licensing changes
Support for DOM and other external tree models
Serialization
Streamed processing of input documents
JAXP interface (transformation, XPath, schema processing)
System Programming Interfaces
Saxon extensions to the W3C XSLT/XQuery specifications
Extensibility mechanisms
Internal changes
XML Schema 1.0 implementation
XML Schema 1.1 implementation
Changes specific to .NET
S9API interface
Localization (natural language support)
Optimizations and performance improvements