In XSLT 2.0 you could pass the parameters as a sequence of strings. That data type isn't available in 1.0, so you have a choice:
(a) create a little XML document in which the parameter strings are represented as elements, and pass this document as a parameter
(b) concatenate the parameter strings using a separator such as TAB, and then tokenize it within the stylesheet.
Probably (a) is easier and (b) is faster.
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference