[xsl] [XPath 3.0] Why should I bother specifying the "arity" of a functi

Hi Folks,

The XPath 3.0 specification says that when a named function is invoked you 
should specify the number of arguments (i.e., the arity):

        NamedFunctionRef           ::=          EQName "#" IntegerLiteral

Here is an example:

        concat#3('Section', ': ', 1)

But this works just as well:

        concat('Section', ': ', 1)

So why should I bother specifying the arity? Is there a case where I *must* 
specify the arity?

/Roger

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