Even worse, in practice you still often only get to use XSLT 1 and XPath 1, because that's what the common Open Source libraries (i.e. libxml/libxslt and Xalan) typically used to embed XSLT into Software support. (The existence of EXSLT should better be forgotten). For anything else, esp. dedicated standalone XSLT development, there is basically only saxon. I wish, there was better Open Source support for XSLT/XPath 2+ but i don't think it's likely to happen.