Optional parameters when calling an XSL template

Question

Is there way to call an XSL template with optional parameters?

For example:

Answer 1

Personally, I prefer doing the following:

  
   
      fooValue
   

I like using explicitly with text so that I can use XPath on my XSL to do searches. It has come in handy many times when doing analysis on an XSL I didn't write or didn't remember.