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Re: [xml-dev] XPath +/- etc not first class functions

The absence of an example in the spec doesn't mean that something can't be done. (The XPath expression //.. never appears in the spec, but it is perfectly legal and even potentially useful).

But yes. + and - are operators (not "primitives"), and operators are not functions. You can easily wrap a function around an operator:

function($x, $y) {$x + $y}

and pass this function to higher-order functions such as fold-left, but you cannot pass the operator itself.

Michael Kay

On 28 Aug 2017, at 07:00, Ihe Onwuka <ihe.onwuka@gmail.com> wrote:

The examples at 


would seem to suggest that primitives such as + and - cannot be passed as values. 


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