Re: FunctionSignature, rev 2

I have been thinking a bit more about the changes you proposed. They point 
into the right direction:

Currently, FunctionSignature.isOverloaded() indicates if a function may accept 
more arguments than those specified in the function signature. A typical 
example is fn:sum().

However, there are also several functions that accept only one, optional 
argument. In this case, the optional argument should be made explicit.

I thus propose that we 

1) add another flag to SequenceType: isOptional. A predefined optional 
argument is then just specified in the argument list like a required 
argument.

2) rename isOverloaded to unlimitedArgs to indicate that a function may accept 
any number of arguments

You can then implement the two methods isUnlimitedArguments() and 
isArgumentCountAllowed() based upon this information.

Wolfgang


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