Hi

I'm trying to create an MVC .Net custom view engine based on Saxon. I'd like to be able to refer to ViewData key/value pairs in my XSLT templates, so following the examples from Saxon, i've added an argument to my transformer like this:
Elsewhere in my C# i've added a ViewData["greeting"] property. Then in my xslt I have
but the xsl fails to compile. I don't understand why this won't work. Any bright ideas?

Thanks