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→hof:top-k-by
|Returns the {{Code|$k}} items in {{Code|$seq}} that are greatest when sorted by the result of {{Code|$f}} applied to the item. The function is a much more efficient implementation of the following scheme:
<pre class="brush:xquery">
( for $x in $seq order by $sort-key($x) descending return $x
)[position() <= $k]
</pre>
