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→Lookup Operator
let $map := map { 'R': 'red', 'G': 'green', 'B': 'blue' }
return (
$map?* (: 1. returns all values; same as: map:keys($map) ! $map(.) :), $map?R (: 2. returns the value associated with the key 'R'; same as: $map('R') :), $map?('G','B') (: 4. returns the values associated with the key 'G' and 'B' :)
),
