Sort List of Maps By Key Value

Using XPath 3 maps:

I have a list of maps where all the maps have a key on whose value I want to sort the list of maps.

Brute force I can do:

let $sortedKeys := $maps ! map:get(., 'sortonme') => sort()
for $key in $sortedKeys
      let $key := .
      let $map := $maps ! if (map:get(., 'sortonme') eq $key) then . else ()
      return func:operate-on-map($map)

But this seems unnecessarily brutish.

I'm still trying to get my head around how to use the "?" operator as well as functional mappings and whatnot.

So is there a more compact or clearer way to order a set of maps based on an order applied to the values of a given entry that exists in each map?

Thanks,

Eliot

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Eliot Kimber
http://contrext.com