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Re: XPath +/- etc not first class functions
- From: Michael Kay <mike@saxonica.com>
- To: ihe.onwuka@gmail.com
- Date: Mon, 28 Aug 2017 09:47:15 +0100
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 Saxonica
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