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5.6.8. Composing FLWOR expressions

Like all other expressions, FLWOR expressions can be composed. In the following examples, a FLWOR is nested in a function call, nested in a FLWOR, nested in an array constructor:
Example 5.124. Nested FLWORs
          for $c in collection("captains")
          where exists(for $m in collection("movies")
                       where some $moviecaptain in let $captain := $m.captain
                                                   return typeswitch ($captain)
                                                          case array return $captain()
                                                          default return $captain
                             $moviecaptain eq $
                       return $m)
          return $
Result (run with Zorba):
[ "James T. Kirk", "Jean-Luc Picard" ]