concat#3 is an expression that returns a function item.
So is concat#3 equivalent to this partial function application:
concat(?, ?, ?)
If yes, when is one preferred over the other?
/Roger
-----Original Message-----
From: Michael Kay [mailto:mike(_at_)saxonica(_dot_)com]
Sent: Wednesday, October 31, 2012 5:54 PM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] [XPath 3.0] Why should I bother specifying the "arity" of a
function that I invoke?
On 31/10/2012 21:06, Costello, Roger L. wrote:
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?
concat#3 is an expression that returns a function item. You need it if
you are going to store the function item in a variable, pass it to
another function, return it from a function, or do other things that you
can do with run-time values.
You don't need a run-time function item if you know statically what
function to call and if the only thing you want to do is to call the
function.
Michael Kay
Saxonica
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