Many more ways to select and match elements including descendants, attributes, comments, processing instructions, and text.
Many more tests for predicates
The xsl:element, xsl:attribute, xsl:processing-instruction, xsl:comment, and xsl:text elements can output elements, attributes, processing instructions, comments, and text calculated from data in the input document.
The xsl:copy-of element to
copy nodes from the input to the output with their contents
intact
Parameters for passing arguments to templates
Modes for reprocessing the same element in a different fashion
Recursion
The xsl:variable element defines named constants that can clarify your code.
Named templates, variables, and attribute sets help you reuse common template code.
The xsl:choose and xsl:when elements
let you select one of several possibilities depending on a condition.
The xsl:import and xsl:include elements merge rules from different style sheets.
Various attributes of the xsl:output element allow you to specify the output document's format, XML declaration, document type declaration, indentation, encoding and MIME type.
Extension functions written in other languages like Java, JavaScript, and C++
Extension elements written in other languages like Java, JavaScript, and C++