> Thanks Allen, it works, I did not know the loc can be treated like a hash.

'loc itself isn't a map even though zip/edit makes it seem that way.
Behind the scenes zip/edit calls (zip/node loc) which will return a
map, at least in the case of this xml example. zip/edit then applies
the function you provided (assoc-in) to this map plus any supplied
args. The result of this replaces the node at loc.

https://github.com/clojure/clojure/blob/59b65669860a1f33825775494809e5d500c19c63/src/clj/clojure/zip.clj#L210

Allen

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