Dynamic context default values

[Michael Kay]

> but I can't understand fn:collection() call (with zero 
> arguments exactly) which should return default collection 
> value from dynamic context. 

I think that's probably one of the features I added purely in order to pass
the tests. I'm not sure the default collection is a particularly useful
concept in most environments, but it isn't too hard to invent some way that
allows users to bind the concept to something in their environment.

Michael Kay
http://www.saxonica.com/