Did you know IntelliJ IDEA 10.5 supports XSLT 2.0? But it does! Major new features are: Support for XPath 2.0 syntax (e.g. if-then-else constructs, for-expressions and a lot more), completion for built-in XPath and XSLT functions Complete support for XPath 2.0 built-in type system. Limited support for user-defined types Complete support for XPath 2.0 and XSLT 2.0 built-in functions Support for new XSLT 2.0 elements, such as custom extension functions (xsl:function) New refactoring: Extract Function, turns an XPath expression into a call to a user-defined function Some example screenshot