[basex-talk] grouping by fuzzy match?

Hello -- Is there some way to assign the abstraction of a fuzzy match to a variable, so that something like for $x in //p let $key := get-fuzzy-match-value($x) group by $key return <similar-paragraphs>{$x}</similar-paragraphs> would be possible? I'm supposing this is one of those things that's either easy or impossible. Thanks! Graydon