change owner, group an permissions for subcollections

chown-collection.xquery

xquery version "3.1";

declare function local:change-user($collection, $user, $group) {
    if (xmldb:collection-available($collection)) then
        (         
          for $child in xmldb:get-child-collections($collection)
          let $path := concat($collection, '/', $child)
          return
              xmldb:set-collection-permissions($path, $user, $group, 493)
        )
    else
        ()
};


let $collection := '/db/apps/lgpn-data/data/persons'

return local:change-user($collection, 'lgpn', 'lgpn')