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Collections in XQuery
•What about collections in expressions ?
•$b/price                       à list of n prices
•$b/price * 0.7              à list of n numbers
•$b/price * $b/quantity à list of n x m numbers ??
•$b/price * ($b/quant1 + $b/quant2)  ¹
  $b/price * $b/quant1 + $b/price * $b/quant2    !!