In "peeking under the hood", it says quite honestly "SLAX is purely syntactic sugar."<p>I think that the XML syntax of XSLT itself was only one barrier for people to adopt XSLT, even in the XML heydays.<p>The main obstacles appear to me that the execution model is hard for people to graps; you need to think both as a parser (apply-templates/) and in a more declarative style at the same time. The XSLT can be in a completely different order to the document and in fact it can visit nodes in the document multiple times, hopping through nodes in a different order each time, with lovely constructs like apply-template with "mode" and "select" mixed with call-template by "name", plus you get to use xpath and for-each to boot. The control flow changes from the order in the input, to some predefined order, and back depending on when you decide to match(-template) or for-each. There's a lot going on at the same time! Fun times!