Subject: Re: [xsl] Sort List of Maps By Key Value From: "Eliot Kimber ekimber@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Mon, 1 Oct 2018 15:30:25 -0000 |
Thanks--that's very helpful. I will cogitate on this more. Cheers, E. -- Eliot Kimber http://contrext.com o;?On 9/29/18, 4:51 PM, "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > I'm still trying to get my head around how to use the "?" operator If you think of a map as being like an element with attributes but no name and no children, then unary "?" behaves like unary "@", while binary "?" behaves like "/@" Compare let $e := (<e x="1" y="2" z="3"/>, <e x="10" y="20" z="30"/> let $m := (map{"x":1, "y":2, "z":3}, map{"x":10, "y":20, "z":30}) then $m?x corresponds to $s/@x (returning (1, 10)) and $m[?x = 1]?y corresponds to $e[@x = 1]/@y (returning 2) The analogy starts to break down for dynamic references: $m?($key) corresponds to $e/@*[name()=$key] (But you can also write it as $m($key) to save one keystroke) Michael Kay Saxonica
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